THINKING TOOLS INC
POS AM, 1998-05-22
EDUCATIONAL SERVICES
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      As filed with the Securities and Exchange Commission on May 22, 1998

                                                      Registration No. 333-11321
================================================================================
                     U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                               ------------------

                        Post-Effective Amendment No. 2 to
                       FORM SB-2 REGISTRATION STATEMENT ON
                                    FORM S-3
                        UNDER THE SECURITIES ACT OF 1933

                              THINKING TOOLS, INC.
                 (Name of small business issuer in its charter)


       Delaware                        7372                       77-0436410    
(State or jurisdiction          (Primary Standard              (I.R.S. Employer 
 of incorporation or        Industrial Classification        Identification No.)
    (organization)              Code Number)                                    
                         
Thinking Tools, Inc.                           Moshe Zarmi, President           
One Lower Ragsdale Drive, 1-250                 Thinking Tools, Inc.            
Monterey, California  93940                One Lower Ragsdale Drive, 1-250      
(Address of principal executive              Monterey, California 93940         
offices and principal place              (408) 373-8688/(408) 373-7020 (Fax)    
of business)                       (Name, address, and telephone number of agent
                                                    for service)                
                                                                                
                               ------------------

                                    Copy to:
                              Stephen H. Kay, Esq.
                  Squadron, Ellenoff, Plesent & Sheinfeld, LLP
                                551 Fifth Avenue
                            New York, New York 10176
                           Telephone: (212) 661-6500
                           Telecopier: (212) 697-6686
                               ------------------

      Approximate date of proposed sale to the public: As soon as practicable
after the effective date of this Registration Statement.

      If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [_}

      If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities Act
of 1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [x]

      If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [_]

      If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [_]

      If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

The Registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the Registrant shall file
a further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Securities and Exchange Commission, acting
pursuant to said Section 8(a), may determine.

================================================================================

<PAGE>


                                EXPLANATORY NOTE

      This Post-Effective Amendment No. 2 on Form S-3 further amends the
Registration Statement on Form SB-2 which was filed by Thinking Tools, Inc. (the
"Company") and declared effective by the Securities and Exchange Commission (the
"Commission") on October 18, 1996 (the "Original Registration Statement"). The
Original Registration Statement was amended by Post-Effective Amendment No. 1
thereto which was filed by the Company on October 16, 1997 and declared
effective by the Commission on October 24, 1997 ("Post-Effective Amendment No.
1"). Post-Effective Amendment No. 1 related to the registration by the inclusion
of alternate Prospectus pages in the Original Registration Statement of (i)
456,250 shares of Common Stock (the "Bridge Warrant Shares") issuable upon the
exercise of warrants (the "Bridge Warrants") issued by the Company in August
1996 and (ii) 140,000 shares of Common Stock (the "Underwriter's Warrant
Shares") issuable upon exercise of the Underwriter's Warrants (the
"Underwriter's Warrants") issued by the Company in connection with the Company's
Initial Public Offering (defined below). This Post-Effective Amendment No. 2
also relates to the registration of the Bridge Warrant Shares and the
Underwriter's Warrant Shares. The Bridge Warrant Shares and the Underwriter's
Warrant Shares are being offered by certain holders of such securities (the
"Selling Stockholders") and not for the account of the Company. All references
to the "Initial Public Offering" refer to the offering and sale by the Company
of 1,610,000 shares of Common Stock which was completed in October 1996.

<PAGE>


PROSPECTUS
- ----------

                    SUBJECT TO COMPLETION DATED MAY___, 1998

                              THINKING TOOLS, INC.

                         596,250 Shares of Common Stock

      This Prospectus relates to the Offering (the "Offering") by certain
selling stockholders (the "Selling Stockholders") of 596,250 shares of Common
Stock, par value $.001 per share, of Thinking Tools, Inc. (the "Company"), which
may be sold from time to time by the Selling Stockholders, or by transferees, on
or after the date of this Prospectus. Of the Shares being offered hereby,
456,250 shares of Common Stock (the "Bridge Warrant Shares") are issuable upon
the exercise of warrants (the "Bridge Warrants") issued by the Company in August
1996 and 140,000 shares of Common Stock (the "Underwriter's Warrant Shares") are
issuable upon exercise of the Underwriter's Warrants (the "Underwriter's
Warrants"). The Bridge Warrant Shares and the Underwriter's Warrant Shares
(collectively, the "Shares") are being offered by the Selling Stockholders and
not for the account of the Company. All references contained herein to the
"Initial Public Offering" refer to the offering and sale by the Company of
1,610,000 shares of Common Stock which was completed in October 1996. See "Risk
Factors-- Future Sales of Restricted Securities; -- Effects of Previously Issued
Options, Warrants and Underwriter's Warrants on Stock Price" and "Selling
Stockholders."

      The Common Stock is quoted on the Nasdaq SmallCap Market (the "Nasdaq
SmallCap Market") under the symbol "TSIM." On May 18, 1998, the last sale price
of the Common Stock reported by the Nasdaq SmallCap Market was $3 5/8 per share.

      No underwriting arrangements have been entered into by the Selling
Stockholders. The distribution of the Shares by the Selling Stockholders may be
effected from time to time in transactions on the Nasdaq SmallCap Market, in
privately negotiated transactions, through the writing of options on the Shares,
or a combination of such methods of sale, at fixed prices that may be changed,
at market prices prevailing at the time of sale, at prices related to such
prevailing market prices, or at negotiated prices. The Selling Stockholders may
effect such transactions by the sale of the Shares to or through broker-dealers,
and such broker-dealers may receive compensation in the form of discounts,
concessions or commissions from the Selling Stockholders and/or the purchasers
of the Shares for whom such broker-dealers may act as agent or to whom they may
sell as principal, or both. Usual and customary or specifically negotiated
brokerage fees or commissions may be paid by the Selling Stockholders in
connection with sales of the Shares. See "Plan of Distribution."

      The Selling Stockholders and intermediaries through whom the Shares are
sold may be deemed "underwriters" within the meaning of the Securities Act of
1933, as amended (the "Act"), with respect to the securities offered and any
profits realized or commissions received may be deemed underwriting
compensation.

      The Company will receive proceeds upon the exercise of the Bridge Warrants
and the Underwriters Warrants, but will not receive any proceeds from sales of
the Shares. See "Use of Proceeds" and "Selling Stockholders."

      AN INVESTMENT IN THE SECURITIES OFFERED HEREBY INVOLVES A HIGH DEGREE OF
RISK AND SHOULD BE CONSIDERED CAREFULLY AND ONLY BY PERSONS WHO CAN AFFORD THE
LOSS OF THEIR ENTIRE INVESTMENT. SEE "RISK FACTORS" BEGINNING ON PAGE 5 HEREIN.

      THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED
UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE. 

                  The date of this Prospectus is May __, 1998
<PAGE>


                              AVAILABLE INFORMATION

      The Company is subject to the informational requirements of the United
States Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files periodic reports, proxy statements and other
information with the United States Securities and Exchange Commission (the
"Commission"). Copies of such periodic reports, proxy statements and other
information can be inspected and copied at the public reference facilities
maintained by the Commission at Judiciary Plaza, 450 Fifth Street, N.W.,
Washington, D.C. 20549 and at the following Regional Offices of the Commission:
Citicorp Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60662;
and Seven World Trade Center, Suite 1300, New York, New York 10048. Copies of
such material can be obtained at prescribed rates from the Public Reference
Section of the SEC, 450 Fifth Street, N.W., Washington, D.C. 20549. The SEC
maintains a World Wide Web site located at http://www.sec.gov which contains
periodic reports, proxy statements and other information regarding registrants
that file electronically with the Commission, including the Company.

      The Company has filed with the Commission, a registration statement on
Form SB-2, as amended by a post-effective amendment on Form S-3 under the
Securities Act (as it may be further amended, the "Registration Statement"), of
which this Prospectus forms a part with respect to the securities offered
hereby. This Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits thereto, as permitted by the rules and
regulations of the Commission. For further information, reference is made to the
Registration Statement and to the exhibits filed therewith. Statements contained
in this Prospectus, or in any document incorporated by reference or deemed to be
incorporated by reference into this Prospectus, as to the contents of any
contract or other document which has been filed as an exhibit to the
Registration Statement are qualified in their entirety by reference to such
exhibits for a complete statement of their terms and conditions. The
Registration Statement and the exhibits thereto may be inspected without charge
at the offices of the Commission as listed above, upon payment of the fees
prescribed by the Commission. The Common Stock is traded on the Nasdaq SmallCap
Market and reports and other information concerning the Company may be inspected
at the offices of the NASD, 1801 K Street, N.W., Washington, D.C. 20006.

                 INCORPORATION OF CERTAIN DOCUMENT BY REFERENCE

      The following documents previously filed by the Company with the
Commission under the Exchange Act are incorporated herein by reference:

      (a)   The Company's Annual Report on Form 10-KSB for the fiscal year ended
December 31, 1997, as amended by Form 10-KSB/A as filed on May 21, 1998;

      (b)   The Company's Quarterly Report on Form 10-QSB for the period ended
March 31, 1998;

      (c)   The description of the Company's Common Stock contained in its
Registration Statement on Form 8-A dated October 18, 1996; and

      (d)   All documents subsequently filed by the Company with the Commission
pursuant to Section 13(a), 13(c), 14, or 15(d) of the Exchange Act after the
date of this Prospectus and prior to the termination of the Offering made hereby
will be deemed to be incorporated by reference into this Prospectus and to be
part hereof from the respective dates of filing of such documents.


                                      -2-
<PAGE>


      Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to modified or superseded for
purposes hereof to the extent that a statement herein (or in any other
subsequently filed document that is or is deemed to be incorporated by reference
herein) modifies or supersedes such previous statement. Any statement so
modified or superseded shall not be deemed to constitute a part hereof except as
so modified or superseded.

      The Company will provide without charge to each person who receives a
Prospectus, upon written or oral request of such person, a copy of the
information that is incorporated by reference herein (not including exhibits to
the information that is incorporated by reference herein). Requests for such
information should be directed to: Thinking Tools, Inc., One Lower Ragsdale
Drive, 1-250, Monterey, California 93940, Attention: Secretary. The Company's
telephone number is (408) 373-8688.


                                      -3-
<PAGE>


                                   THE COMPANY


      The following summary is qualified in its entirety by reference to the
more detailed information and the financial statements and related notes thereto
appearing elsewhere in this Prospectus or incorporated herein by reference. Each
prospective investor is urged to read this Prospectus in its entirety.
Investment in the securities offered hereby involves a high degree of risk. See
"Risk Factors" starting on page 5.

      Thinking Tools, Inc. (the "Company") was incorporated in Delaware on
August 8, 1996, as a wholly-owned subsidiary of Thinking Tools, Inc., a
California corporation (the "Predecessor Company"). On August 30, 1996, the
Predecessor Company was merged with and into the Company. References herein to
the "Company" include the Predecessor Company.

      The Company was formed on December 30, 1993, to purchase certain assets of
the Business Simulation Division (the "Division") of Maxis, Inc., a leading
computer game company and creator of the simulation game SimCityTM. Through the
purchase agreement with Maxis, Inc., the Company acquired the Division's
equipment, staff, work-in-progress, customers, prospects, software tools,
libraries and processes.

      The Company develops powerful and flexible PC-based business simulation
software programs that enable users to simulate real life business situations,
explore complex operational problems and improve functional and problem solving
skills. The Company's agent-based, adaptive simulation software has a broad
range of potential business applications, including strategic planning, sales
and marketing, training, competitive positioning, product marketing, operations
planning and logistics.

      The Company is currently pursuing a strategy pursuant to which it has
shifted its focus from custom software development projects contracted for by
specific customers to self-funded product development for broader markets
utilizing the Company's agent-based, adaptive simulation technology. The
Company's first internally-funded product, Think 2000, a Year 2000 risk
simulation software program, was introduced in late 1997 and enables executive
decision-makers to assess the overall business impact of problems associated
with the Year 2000 date change.

      The Company's principal executive offices are located at One Lower
Ragsdale Drive, 1-250, Monterey, California 93940, and its telephone number is
(408) 373-8688.


                                      -4-
<PAGE>


                                  RISK FACTORS


      Statements made in this Prospectus, including the documents incorporated
herein by reference, that are not statements of historical fact, constitute
"forward-looking statements" within the meaning of the Private Securities
Litigation Reform Act of 1995. Such forward-looking statements involve known and
unknown risks, uncertainties and other factors that could cause the actual
results of the Company to be materially different from the historical results or
from any future results expressed or implied by such forward-looking statements.
In addition to statements which explicitly describe such risks and
uncertainties, readers are urged to consider statements labeled with the terms
"believes," "belief," "expects," "plans," "anticipates," or "intends" to be
uncertain and forward-looking. All cautionary statements made in this Prospectus
should be read as being applicable to all related forward-looking statements
wherever they appear. Investors should consider the following risk factors as
well as the risks described elsewhere in this Prospectus, including the
documents incorporated herein by reference.

Limited Operating History; Accumulated Deficit; History of Losses; Uncertain
Future Profitability

      The Company commenced operations in December 1993 and is still in the
early stage of developing products. Since its inception, the Company has
experienced cumulative losses of $8,726,000 and $9,506,000 as of December 31,
1997 and March 31, 1998, respectively, and has not experienced any quarter of
profitable operations. Consequently, its operations are subject to numerous
risks associated with the development of a new business. The Company expects to
continue to incur operating losses for the foreseeable future, principally as a
result of expenses associated with the Company's product development efforts and
anticipated sales, marketing and general and administrative expenses. In
September 1997, the Company introduced a new product, Think 2000, a Year 2000
risk simulation software program. There can be no assurance that Think 2000 will
achieve commercial acceptance or result in revenues or profits to the Company.
There can also be no assurance that if Think 2000 does achieve commercial
acceptance the Company will be able to meet demand for such product on a timely
basis. The Company has made a significant investment in the development and
commercialization of Think 2000, and does not currently anticipate significant
revenues in the near future from other sources. Accordingly, the Company is
materially dependent upon the success of Think 2000, and there can be no
assurance that Think 2000 will achieve commercial acceptance or result in
significant revenues or profits to the Company. Any failure of the Company to
commercialize Think 2000 or to meet demands for such product on a timely basis
could have a material adverse effect on the Company's business, operating
results and financial condition. The Company's long-term viability and growth
will depend on the successful development, commercialization and marketing of
its proposed products. There can be no assurance that the Company will be able
to develop adequate revenue sources to successfully complete the development,
commercialization and marketing of its proposed products or that if it is
successful in doing so it will be able to achieve and maintain profitability.

      The Company's financial statements for the year ended December 31, 1997,
which are incorporated herein by reference, were prepared assuming the Company
will continue as a going concern and do not include any adjustments that might
result from the outcome of the uncertainty regarding the Company's ability to
continue as a going concern.


                                      -5-
<PAGE>


Fluctuations in Operating Results; Substantial Revenues Derived from Limited
Customers

      The Company's operating results may vary significantly from quarter to
quarter or year to year, depending on factors such as the timing of product
development, the timing of increased research and development and sales and
marketing expenses, the timing and size of orders and the introduction of new
products by the Company. Consequently, revenue or profit may vary significantly
from quarter to quarter or year to year and revenue or profit in any period will
not necessarily be predictive of results in subsequent periods.

      Historically, a significant portion of the Company's revenues has been
derived from a limited number of relatively large development projects
contracted for by a small number of customers. Such customers are not affiliated
with the Company, and all such contracts had been completed as of December 31,
1997. The Company historically has not had, and at December 31, 1997 and March
31, 1998, did not have, any substantial firm order backlog. The Company's
current and planned expense levels are based in part on its expectations as to
future revenue. There can be no assurance that the Company will obtain
additional sources of revenue. Any inability by the Company to obtain new
sources of revenues would have a material adverse effect on the Company's
business, financial condition and results of operations.

Need For Additional Financing

      Based on the Company's operating plan, the Company believes its existing
cash balances will be adequate to satisfy its operating and capital requirements
through the middle of the third quarter of fiscal 1998. Such belief is based
upon certain assumptions, and there can be no assurance that such assumptions
are correct. However, the Company does not expect that it will be able to
continue its operations beyond this time without additional financing and may
need to raise additional debt or equity financing to fund its future operations
and growth strategy. The Company anticipates that it will be required to seek
additional funding through public or private sales of debt or equity securities.
The Company is currently evaluating its financing options; however there can be
no assurance that additional financing will be available when needed on terms
acceptable to the Company, or at all.

Dependence on Emerging Market for Business Simulation Software

      The markets for business simulation software in general, and agent-based,
adaptive simulation software in particular, are still emerging, making it
difficult to predict with any assurance the future size of the markets. There
can be no assurance that such software will achieve broad-based market
acceptance, that markets for such software will continue to grow or that
increased sales of the Company's products will occur or continue as a result of
any such growth. There can be no assurance that alternatives to the Company's
agent-based, adaptive simulation software, such as object-oriented tools,
authoring tools or game methods will not achieve greater market acceptance than
the Company's agent-based, adaptive simulation software. Even if agent-based,
adaptive simulation achieves market acceptance and that market grows, there can
be no assurance that the Company will obtain a significant share of that market.

Risk of Competition

      There can be no assurance that other companies will not develop programs
such as those offered by the Company or alternative software applications which
meet the same needs of customers, or that potential customers will not choose to
meet their needs through in-house development rather than by purchasing the


                                      -6-
<PAGE>


Company's products. The Company expects to be subject to competition from
companies with substantially greater resources. There can be no assurance that
the Company will be able to respond to competitive pressures, or that the effect
of competitive pressures will not change the demand for, or pricing of, the
Company's products and services. To the extent that competitors achieve
performance, price or other selling advantages, the Company could be adversely
affected. There can be no assurance that the Company will have the resources
required to respond effectively to market or technological changes or to
otherwise compete successfully in the future.

Uncertainties Related to Development of Additional Products

      Significant additional efforts will be required for the Company to develop
additional agent-based, adaptive simulation products. Any such future efforts
are subject to certain risks including, but not limited to, the risk that new
simulations will be difficult to develop into commercially viable products free
of competitive challenges and that any such products may fail to achieve and
sustain market acceptance. There can be no assurance that the Company's product
development efforts will be successful. Further, the Company is relying on the
success of its current products, principally Think 2000, as well as the
successful development, commercialization and marketing of additional products
for its long-term viability and growth. Any failure of the Company to
commercialize its products or to meet demands for such products on a timely
basis could have a material adverse effect on the Company's business, operating
results and financial condition.

Technological Change; Risk of Obsolescence; Industry Standards

      The software industry is characterized by rapid technological change,
frequent introductions of new products, changes in customer demands and evolving
industry standards. The introduction of products embodying new technology or the
adaptation of products to the market and the emergence of new industry standards
often render existing products obsolete and unmarketable.

      The Company believes that its success will depend on its ability to
enhance its existing products and otherwise respond and keep pace with
technological developments and emerging industry standards. There can be no
assurance that the Company will be successful in developing enhanced or new
products that respond to technological changes or evolving industry standards in
a timely manner, or at all. Additionally, there can be no assurance that
technological changes or evolving industry standards will not render the
Company's products and technologies obsolete.

Uncertainties Regarding Intellectual Property

      The Company does not have any patents and has not filed patent
applications on its products. The Company regards the software that it owns or
licenses as proprietary and relies primarily on a combination of trade secret
laws, nondisclosure agreements and other technical copy protection methods (such
as embedded coding) to protect its rights to its products and proprietary
rights. It is the Company's policy that all employees and third-party developers
sign nondisclosure agreements; however, this may not afford the Company
sufficient protection for its know-how and its proprietary products.

      Other parties may develop similar know-how and products, duplicate the
Company's know-how and products or develop patents that would materially and
adversely affect the Company's business, financial condition and results of
operations. Third parties may assert infringement claims against the Company,
and such claims may result in the Company being required to enter into royalty
arrangements, pay damages or


                                      -7-
<PAGE>


defend litigation, any of which could materially and adversely affect the
Company's business, financial condition and results of operations.

Limited Marketing Experience; Need for Additional Personnel

      The Company has very limited marketing resources and limited experience in
marketing and selling its products and services. The Company will have to
further develop its marketing and sales force or rely principally on
collaborators, licensees or others to provide for the marketing and sales of its
products and services. There can be no assurance that the Company will be able
to establish adequate marketing and sales capabilities or make arrangements with
value added resellers ("VARs"), collaborators, licensees or others to perform
such activities.

      Achieving market penetration will require significant efforts by the
Company to create awareness of, and demand for, its proposed products.
Accordingly, the Company's ability to expand its customer base will depend upon
its marketing efforts, including its ability to establish an effective internal
sales organization or strategic marketing arrangements with others. The failure
by the Company to successfully develop its marketing capabilities, internally or
through others, would have a material adverse effect on the Company's business,
financial condition, cash flows and results of operations. Further, there can be
no assurance that the development of such marketing capabilities will lead to
sales of the Company's proposed products.

      The success of the Company will also depend upon its ability to hire and
retain additional qualified management, marketing and financial personnel, as to
which there can be no assurance. The Company will compete with other companies
with greater financial and other resources for such personnel.

Risks Associated with Growth Strategy

      The Company's growth strategy is expected to place a significant strain on
its management, administrative, operational, financial and other resources. The
Company's success will be dependent upon its ability to hire additional highly
qualified personnel to support the Company's product development and marketing
efforts, including monitoring operations, controlling costs and maintaining
effective management, inventory and credit controls. The Company has limited
experience in effectuating rapid expansion and managing a broad range of
products and services and significant operations. There can be no assurance that
the Company will be able to continue to manage its operations or that any
inability to do so will not adversely affect its business, financial condition
or results of operations.

Dependence on Key Personnel

      The Company is dependent upon the continued efforts and abilities of its
senior management, particularly those of Mr. Moshe Zarmi, the Company's
President and Chief Executive Officer and Mr. John Hiles, the Company's Founder,
Chief Technology Officer, and Secretary. The Company has entered into an
Employment Agreement with Mr. Hiles which is subject to automatic annual
renewals unless terminated by the Company or Mr. Hiles upon ninety days' prior
written notice. The loss or unavailability of Mr. Hiles or Mr. Zarmi for any
significant period could have a material adverse effect on the Company's
business, financial condition and results of operations. The Company maintains a
$5,000,000 key-man life insurance policy on Mr. Hiles. The Company's operations
are also dependent upon its ability to attract and retain qualified programmers
and software engineers. There can be no assurance that the Company will be able
to attract and


                                      -8-
<PAGE>


retain such skilled personnel, and failure to do so could have a material
adverse effect on the business, financial condition and results of operations of
the Company. All other employees of the Company are at-will employees.

Control by Management and Principal Stockholders

      Mr. John Hiles owns 1,076,677 shares of Common Stock which represents
approximately 23.2% of the Company's outstanding Common Stock. Mr. Fred Knoll,
the Company's Chairman of the Board, controls Thinking Technologies, L.P., a
limited partnership ("Technologies") and principal stockholder of the Company,
which owns 1,955,081 shares of Common Stock, representing approximately 42.1% of
the Company's outstanding Common Stock. Together, Messrs. Hiles and Knoll own or
control an aggregate of 3,031,758 shares of Common Stock, representing
approximately 65.3% of the outstanding Common Stock. As a result of such
ownership and control, Messrs. Hiles and Knoll have the ability to control the
election of the directors of the Company and the outcome of all issues submitted
to a vote of the stockholders of the Company. Additionally, Mr. Knoll controls
warrants to purchase 468,242 shares of Common Stock at an exercise price of
$1.07 per share issued to Technologies (the "Technologies Warrants") in July
1996, and Bridge Warrants issued to Technologies to purchase 156,250 shares of
Common Stock, at an exercise price of $3.90 per share, which were issued by the
Company to purchasers of its 10% Senior Secured Promissory Notes (the "Bridge
Notes") in connection with a debt financing consummated in August 1996 (the
"Bridge Financing").

Nasdaq Delisting; Low Stock Price

      The trading of the Company's Securities on the Nasdaq SmallCap Market is
conditioned upon the Company meeting certain net tangible asset, market
capitalization, or net income requirements, stock price tests and certain other
requirements set forth by such exchange. To maintain eligibility for trading on
the Nasdaq SmallCap Market, the Company will be required to maintain a bid price
of $1.00 per share. In addition, the Company will also have to maintain
compliance with at least one of the following requirements: net tangible assets
in excess of $2,000,000, market capitalization of $35,000,000 or net income (in
the latest fiscal year or two of the last three fiscal years) of $500,000. As of
the date of this Prospectus, the Company is not in compliance with such
continued listing requirements; accordingly, there can be no assurance that the
Common Stock will not be delisted from trading on the Nasdaq SmallCap Market.

      The effects of delisting include the limited release of the market prices
of the Company's securities and limited news coverage of the Company. Delisting
may restrict investors' interest in the Company's securities and materially
adversely affect the trading market and prices for such securities and the
Company's ability to issue additional securities or to secure additional
financing. In addition to the risk of volatile stock prices and possible
delisting, low price stocks are subject to the additional risks of federal and
state regulatory requirements and the potential loss of effective trading
markets. In particular, if the Common Stock were delisted from trading on such
exchange and the trading price of the Common Stock was less than $5.00 per
share, the Common Stock could be subject to Rule 15g-9 under the Securities
Exchange Act of 1934, as amended, which, among other things, requires that
broker/dealers satisfy special sales practice requirements, including making
individualized written suitability determinations and receiving purchasers'
written consents, prior to any transaction.

      If the Company's securities could also be deemed penny stocks under the
Securities Enforcement and Penny Stock Reform Act of 1990, this would require
additional disclosure in connection with trades in the Company's securities,
including the delivery of a disclosure schedule explaining the nature and risks
of the penny stock market. Such requirements could severely limit the liquidity
of the Company's securities.


                                      -9-
<PAGE>


Future Sales of Restricted Securities

      The Company had 4,641,758 shares of Common Stock outstanding as of March
31, 1998. Of these shares, all 1,610,000 shares of Common Stock sold in the
Initial Public Offering are freely transferable by persons other than affiliates
of the Company, without restriction or further registration under the Securities
Act of 1933, as amended (the "Securities Act"). The remaining 3,031,758 shares
of Common Stock (the "Restricted Shares") outstanding were sold by the Company
in reliance on exemptions from the registration requirements of the Securities
Act and are "restricted securities" as defined in Rule 144 under the Securities
Act. The sale of a substantial number of shares of Common Stock or the
availability of Common Stock for sale could adversely affect the market price of
the Common Stock prevailing from time to time.

Effect of Previously Issued Options, Warrants and Underwriter's Warrants on
Stock Price

      The Company has reserved from the authorized, but unissued Common Stock,
600,000 shares of Common Stock for issuance to key employees, officers,
directors, and consultants pursuant to the Company's 1997 Stock Option Plan (the
"1997 Plan"); 376,000 shares of Common Stock for issuance to key employees,
officers, directors, and consultants pursuant to the Company's 1996 Stock Option
Plan (the "1996 Plan"); 273,964 shares of Common Stock for issuance to officers,
directors and a consultant pursuant to stock options granted outside of the
Plan; 456,250 shares of Common Stock for issuance upon exercise of the Bridge
Warrants; and 468,242 shares of Common Stock for issuance upon exercise of the
Technologies Warrants. In connection with the Initial Public Offering, the
Company also sold to Barington Capital Group, L.P. ("Barington"), for nominal
consideration, the Underwriter's Warrants to purchase an aggregate of 140,000
shares of Common Stock at a price per share equal to $10.40 (160% of the Initial
Public Offering price per share), subject to adjustment as provided therein.

      The existence of any outstanding options issued under the 1997 Plan, the
1996 Plan, the Bridge Warrants, the Underwriter's Warrants, and other
outstanding options and warrants may prove to be a hindrance to future
financing, since the holders of such warrants and options may be expected to
exercise them at a time when the Company would otherwise be able to obtain
additional equity capital on terms more favorable to the Company. The shares
underlying the Bridge Warrants and the Underwriter's Warrants may be sold in
accordance with this Prospectus, and the sale of the shares, or the availability
of such shares for sale, could adversely affect the market price of the Common
Stock. Additionally, if the holders of the Underwriter's Warrants were to effect
a distribution of such Underwriter's Warrants or underlying securities, such
underwriter, prior to and during such distribution, would be unable to make a
market in the Company's securities and would be required to comply with other
limitations on trading set forth in Regulation M promulgated under the
Securities Exchange Act of 1934, as amended. Such rules restrict the
solicitation of purchasers of a security when a person is interested in the
distribution of such security and also limit market making activities by an
interested person until the completion of the distribution. If such underwriter
were required to cease making a market, the market and market price for such
securities may be adversely affected and holders of such securities may be
unable to sell such securities.

Share Prices May Be Highly Volatile

      The market prices of equity securities of computer technology and software
companies have experienced extreme price volatility in recent years for reasons
not necessarily related to the individual performance of specific companies.
Accordingly, the market price of the Common Stock may be highly volatile.
Factors such as announcements by the Company or its competitors concerning
products, patents, technology,


                                      -10-
<PAGE>


governmental regulatory actions, other events affecting computer technology and
software companies generally as well as general market conditions may have a
significant impact on the market price of the Common Stock and could cause it to
fluctuate substantially.

Lack of Dividends

      The Company has not paid any dividends on the Common Stock since its
inception and does not intend to pay any dividends to its stockholders in the
foreseeable future. The Company currently intends to reinvest earnings, if any,
in the development and expansion of its business.

Anti-Takeover Effects of Certain Provisions of Certificate of Incorporation and
Delaware Law

      The Company's Certificate of Incorporation authorizes the issuance of
3,000,000 shares of undesignated preferred stock with such designations, rights
and preferences as may be determined from time to time by the board of
directors. Accordingly, the board of directors is empowered, without obtaining
stockholder approval, to issue such preferred stock with dividend, liquidation,
conversion, voting or other rights that could adversely affect the voting power
or other rights of the holders of the Common Stock. In the event of issuance,
the preferred stock could be utilized, under certain circumstances, as a method
of discouraging, delaying or preventing a change in the control of the Company.
Certain provisions of Delaware law may also discourage third-party attempts to
acquire control of the Company.


                                      -11-
<PAGE>


                                 USE OF PROCEEDS

      The Company will not receive any proceeds from the sale of the Shares by
the Selling Stockholders. The net proceeds to the Company from the exercise of
the Bridge Warrants and Underwriter's Warrants are estimated to be $3,235,375,
if all of the Bridge Warrants and Underwriter's Warrants are exercised. The
Company is unable to predict the time, if ever, when the Bridge Warrants or
Underwriter's Warrants will be exercised. It is expected that the net proceeds
from the exercise of the Bridge Warrants and Underwriter's Warrants, if and when
received, will be used by the Company for general corporate purposes.


                                      -12-
<PAGE>


                              SELLING STOCKHOLDERS

      The following table sets forth the name of each person who is a Selling
Stockholder, the number of securities of the Company owned by each person's
account, the percentage or outstanding shares of Common Stock of the Company
owned by such person prior to this Offering, the number of shares being sold by
such person, the number of shares of Common Stock such person will own after the
completion of this Offering, and the percentage of outstanding shares of Common
Stock of the Company owned by such person after the completion of this Offering.

<TABLE>
<CAPTION>
                                               Beneficial Ownership                              Beneficial Ownership
                                                Prior to Offering            Number of              After Offering
                                         -----------------------------        Shares          --------------------------
                                            Shares          Percentage     Being Sold(1)        Shares        Percentage
                                         ------------       ----------     -------------      ----------      ----------
<S>                                          <C>                <C>            <C>             <C>              <C>
Alladin Depot Partnership ..........         6,250               *             6,250                  --          *
Marvin Barish ......................         6,250               *             6,250                  --          *
B&B Trading Retirement Plan ........         6,250               *             6,250                  --          *
Barington Capital Group, L.P. ......       140,000(2)            *           140,000                  --          *
Gerald Benjamin ....................         6,250               *             6,250                  --          *
CLFS Equities, Ltd. ................         6,250               *             6,250                  --          *
Steven A. Endquist .................        12,500               *            12,500                  --          *
Donald Heimstaedt ..................         6,250               *             6,250                  --          *
Peter Horrigan .....................         6,250               *             6,250                  --          *
Robert Jacobs                                                                             
   IRA R/O .........................         6,250               *             6,250                  --          *
Dr. Harvey Kaplan ..................         6,250               *             6,250                  --          *
David Kohane .......................         6,250               *             6,250                  --          *
James Levi .........................         6,250               *             6,250                  --          *
Lyonshare Venture Capital ..........        56,250               *            56,250                  --          *
Paul Matusow .......................         6,250               *             6,250                  --          *
Alexander Mitchell .................         6,250               *             6,250                  --          *
David Mitchell .....................        18,750               *            18,750                  --          *
Oliver Mitchell ....................         6,250               *             6,250                  --          *
Guy Montanari ......................         6,250               *             6,250                  --          *
New York Urban Professional 
Basketball League Profit Sharing ...         6,250               *             6,250                  --          *
Eric & Suzanne Partch ..............         6,250               *             6,250                  --          *
Jerry Politzer .....................         6,250               *             6,250                  --          *
Wayne Saker ........................        12,500               *            12,500                  --          *
Paul and Linda Salsgiver ...........        12,500               *            12,500                  --          *
Philip Schonfeld ...................         6,250               *             6,250                  --          *
Floyd M. Smith .....................         6,250               *             6,250                  --          *
C.M. Solomon .......................         6,250               *             6,250                  --          *
Robert Spitzer .....................         6,250               *             6,250                  --          *
Michael Stoyka, M.D ................         6,250               *             6,250                  --          *
Dr. Gershon Stern ..................        12,500               *            12,500                  --          *
Thinking Technologies, L.P. ........     2,579,573(3)           49%          156,250           2,423,323        46.3%
Woodland Partners ..................        25,000               *            25,000                  --          *
Steve Yavers .......................         6,250               *             6,250                  --          *
</TABLE>

- ----------------
* less than 1%
(1) Represents Shares underlying the Bridge Warrants and Underwriter's Warrants.
(2) Represents Shares underlying the Underwriter's Warrants which were issued to
Barington in connection with the Initial Public Offering for which Barington
acted as managing underwriter.
(3) Includes 468,242 shares of Common Stock issuable upon the exercise of the
Technologies Warrants and 156,250 shares of Common Stock issuable upon exercise
of Bridge Warrants issued as part of the Bridge Units purchased by Technologies.
Does not include 75,454 shares of Common Stock which may be purchased by
Technologies from John Hiles upon the exercise of an outstanding option for
$5.00 per share. Fred Knoll, the Chairman of the Board of the Company, controls
Technologies through certain affiliates.


                                      -13-
<PAGE>


Plan of Distribution

      The Shares offered by this Prospectus may be sold from time to time by the
Selling Stockholders. As of the date hereof, the Company is not aware of any
underwriting arrangements that have been entered into by the Selling
Stockholders. The distribution of the Shares by the Selling Stockholders may be
effected in one or more transactions that may take place in the over-the-counter
market, in privately negotiated transactions, in the Nasdaq SmallCap Market or
otherwise, at prevailing market prices at the time of sale, prices related to
prevailing market prices, or as may be negotiated at the time of sale. Without
limiting the generality of the foregoing, the Shares offered by the Selling
Stockholders may be sold by one or more of the following methods, without
limitation: (a) ordinary brokerage transactions and transactions in which the
broker solicits purchasers; (b) a block trade in which a broker or dealer so
engaged will attempt to sell the shares as agent but may position and resell a
portion of the block as principal to facilitate the transaction or other "block"
sales; (c) purchases by a broker or dealer as principal and resale by such
broker or dealer for its account pursuant to this Prospectus; and (d)
face-to-face transactions between sellers and purchasers without a
broker-dealer. The Shares may also be publicly offered through agents,
underwriters or dealers. Underwriter's discounts and usual and customary or
specifically negotiated brokerage fees or commissions may be paid by a Selling
Stockholder in connection with sales of the Shares. To the extent required, the
number of Shares to be sold, the name of the Selling Stockholder, the purchase
price, the name of any agent or broker, and any applicable commissions,
discounts or other compensation to such agents or brokers with respect to a
particular offering will be set forth in a Prospectus Supplement.

      The Selling Stockholders may enter into hedging transactions with
broker-dealers with respect to the Shares. In connection with such transactions,
broker-dealers may engage in short sales of the Shares in the course of hedging
the positions they assume with the Selling Stockholders. The Selling
Stockholders may also sell the Shares short and redeliver the Shares to close
out the short positions. The Selling Stockholders may also enter into option or
other transactions with broker-dealers which require the delivery to
broker-dealers of the Shares. The Selling Stockholders may also loan or pledge
the Shares to a financial institution or a broker-dealer and the financial
institution or the broker-dealer may sell the Shares so loaned or upon a default
the financial institution or the broker-dealer may effect sales of the pledged
shares. In addition to the foregoing, the Selling Stockholders may, from time to
time, enter into other types of hedging transactions.

      In order to comply with certain state securities laws, if applicable, the
Shares will be sold in such jurisdictions only through registered or licensed
brokers or dealers. In certain states, the Shares may not be sold unless such
Shares have been registered or qualified for sale in such state or an exemption
from registration or qualification is available and is complied with.

      Under applicable rules and regulations under the Exchange Act, any person
engaged in a distribution of the Shares may not simultaneously engage in
market-making activities with respect to such Shares for a period of one or five
business days prior to the commencement of such distribution. In addition to,
and without limiting, the foregoing, each of the Selling Stockholders and any
other person participating in a distribution will be subject to the applicable
provisions of the Exchange Act and the rules and regulations thereunder,
including, without limitation, Regulation M, which provisions may limit the
timing of purchases and sales of any of the Shares by the Selling Stockholders
or any such other person. All of the foregoing may affect the marketability of
the Shares.


                                      -14-
<PAGE>


                                  LEGAL MATTERS

      The validity of the Common Stock offered hereby and certain other legal
matters will be passed upon for the Company by Squadron, Ellenoff, Plesent &
Sheinfeld, LLP, New York, New York.


                                     EXPERTS

      The financial statements incorporated in this prospectus by reference from
the Company's Annual Report on Form 10-KSB for the year ended December 31, 1997
have been audited by Deloitte & Touche LLP, independent auditors, as stated in
their report (which expresses an unqualified opinion and includes an explanatory
paragraph concerning certain factors which raise substantial doubt about the
Company's ability to continue as a going concern), which is incorporated herein
by reference, and have been so incorporated in reliance upon the report of such
firm given upon their authority as experts in accounting and auditing.


                                      -15-
<PAGE>


=====================================    =======================================
                                                                               
No dealer, salesperson or any other                                            
person has been authorized to give                                             
any information to make any                                                    
representations other than those                                               
contained in this Prospectus in                                                
connection with the Offering made                                              
hereby, and, if given or made, such                                            
information or representation must                  596,250 Shares             
be relied upon as having been                                                  
authorized by the Company or the                                               
Selling Stockholders.This Prospectus                                           
does not constitute an offer to                                                
sell, or a solicitation of an offer                                            
to buy, any of the securities                     THINKING TOOLS, INC.         
offered hereby in any jurisdiction                                             
to any person to whom it is unlawful                                           
to make such an offer or                                                       
solicitation in such jurisdiction.                                             
Neither the delivery of this                                                   
Prospectus nor any sale made                                                   
hereunder shall under any                                                      
circumstances create any implication                 Common Stock              
that there has been no change in the                                           
affairs of the Company since the                                               
date hereof or that the information                                            
contained herein is correct as of                                              
any time subsequent to the dates as                                            
of which such information is                                                   
furnished.                                                                     
                                                                               
          ------------------                 ---------------------------
                                                                            
           TABLE OF CONTENTS                         PROSPECTUS            
                                             ---------------------------   
                                  Page                                     
                                                                           
Available Information.............  2                                      
Incorporation of                                                           
  Certain Documents                                                        
  by Reference....................  2                                      
The Company.......................  4                                      
Risk Factors......................  5                                      
Dividend Policy................... 11               May __, 1998           
Use of Proceeds................... 12                
Selling Stockholders.............. 13                
Plan of Distribution.............. 14                                      
Legal Matters..................... 15                                      
Experts........................... 15                                      



=====================================    =======================================
<PAGE>


                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item. 14  Other Expenses of Issuance and Distribution.

      The following table sets forth the various expenses which will be paid by
the Registrant in connection with the issuance and distribution of the
securities being registered. All amounts shown are estimates.


          Legal fees and expenses ......................      $ 5,000
          Accounting fees and expenses .................        2,500
          Miscellaneous expenses .......................        5,000
                                                              =======
          Total ........................................      $12,500
                                                              =======

Item 15.  Indemnification of Officers and Directors.

     Article Ninth of the Certificate of Incorporation of Thinking Tools, Inc.
(the "Registrant") eliminates the personal liability of directors to the
Registrant or its stockholders for monetary damages for breach of fiduciary duty
as a director, provided that such elimination of the personal liability of a
director of the Registrant does not apply to (a) any breach of the director's
duty of loyalty to the Registrant or its stockholders, (b) acts or omissions not
in good faith or which involve intentional misconduct or a knowing violation of
law, (c) actions prohibited under Section 174 of the Delaware General
Corporation Law, or (d) any transaction from which the director derived an
improper personal benefit.

Item 16.  Exhibits

(a)      The following exhibit are filed herewith:

         Exhibit No.
         -----------

         1.1*     Form of Underwriting Agreement

         3.1*     Certificate of Incorporation of Thinking Tools, Inc.

         3.2*     By-Laws of Thinking Tools, Inc.

         4.1*     Form of Underwriter's Option Agreement

         4.2*     1996 Stock Option Plan

         4.3*     Form of Stock Certificate

         4.4*     Form of Private Placement Investors' Warrant

         4.5*     Technologies Warrant

         4.6*     Form of Private Placement Note


                                      II-1
<PAGE>


         4.7*     Form of Lock-up Agreement

         5.1*     Opinion of Squadron, Ellenoff, Plesent & Sheinfeld, LLP

         10.1*    Employment Agreement between the company and John Hiles

         10.2*    Form of Consulting Agreement

         10.3*    Development Agreement between the Company and Systemhouse
                  dated June 30, 1995

         10.4*    Services Agreement between the Company and Systemhouse dated
                  March 8, 1995

         10.5*    Vertical Market Software Development/Licensing Agreement
                  between the Company and Coopers dated October 12, 1994

         10.6*    Technologies Agreement between the Company and Technologies
                  dated September 26, 1994

         10.7*    Consent, Waiver and Amendment between the Company and
                  Technologies dated August 31, 1996.

         10.8*    Lease between the Company and KI Monterey Research, Inc. dated
                  August 19, 1994, as amended.



         23.1     Independent Auditors' Consent -- Deloitte & Touche LLP

         23.3     Consent of Squadron, Ellenoff, Plesent & Sheinfeld, LLP

         24.1*    Power of Attorney

         ------------
         * Previously filed.


Item 17.  Undertakings

      (d)   The undersigned Registrant hereby undertakes that it will:

            (1)   File, during any period in which it offers or sells
securities, a post-effective amendment to this registration statement:

                  (i)   Include any prospectus required by section 10(a)(3) of
the Securities Act:

                  (ii)  Reflect in the prospectus any facts or events, which,
individually or together, represent a fundamental change in the information in
the registration statement; and notwithstanding the foregoing, any increase or
decrease in volume of securities offered (if the total dollar value of
securities offered


                                      II-2
<PAGE>


would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum Offering range may be reflected in the form of
prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in the volume and price represent no more than a 20%
change in the maximum aggregate offering price set forth in the "Calculation of
Registration Fee" table in the effective registration statement.

                  (iii) Include any additional or changed material information
on the plan of distribution;

            (2)   For determining liability under the Securities Act, treat each
post-effective amendment as a new registration statement of the securities
offered, and the Offering of the securities at that time to be the initial bona
fide Offering.

            (3)   File a post-effective amendment to remove from registration
any of the securities that remain unsold at the end of the Offering.

      (e)   Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer, or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.

      (f)   The Registrant hereby undertakes that it will:

            (1)   For determining any liability under the Securities Act, treat
            the information omitted from the form of prospectus filed as part of
            this registration statement in reliance upon Rule 430A under the
            Securities Act and contained in a form of prospectus filed by the
            Registrant under Rule 424(b)(1) or (4) or 497(h) under the
            Securities Act as part of this registration statement as of the time
            the Securities and Exchange Commission declared it effective.

            (2)   For determining any liability under the Securities Act, treat
            each post-effective amendment that contains a form of prospectus as
            a new registration statement relating to the securities offered in
            the registration statement, and that Offering of the securities at
            that time as the initial bona fide Offering of those securities.


                                      II-3
<PAGE>


                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that is has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Post-Effective
Amendment No. 2 to the Registration Statement on Form SB-2 on Form S-3 to be
signed on its behalf by the undersigned, thereunto duly authorized, in The City
of Monterey, California on May 20, 1998.

                                              THINKING TOOLS, INC.              
                                              
                                              By: /s/ Moshe Zarmi
                                                  ------------------------------
                                                  Moshe Zarmi
                                                  President and CEO

      Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 2 to the Registration Statement on Form SB-2 on
Form S-3 has been signed by the following persons in the capacities and on the
dates indicated.


            Signature                         Title                     Date
            ---------                         -----                     ----
/s/ Moshe Zarmi                     President, CEO and Director     May 20, 1998
- ---------------------------------   
Moshe Zarmi                         
                                    
/s/ Patricia Kessler                Principal Financial Officer     May 20, 1998
- ---------------------------------   
Patricia Kessler                    
                                    
/s/ John Hiles                      Chief Technology Officer and    May 20, 1998
- ---------------------------------   Director
John Hiles                          
                                    
/s/ Fred Knoll                      Chairman of the Board and       May 20, 1998
- ---------------------------------   Director
Fred Knoll                          
                                    
                *                   Director                        May 20, 1998
- ---------------------------------   
Marc Cooper                         
                                    
                *                   Director                        May 20, 1998
- ---------------------------------   
Esther Dyson                        
                                    
                *                   Director                        May 20, 1998
- ---------------------------------   
Frederick Gluck                     
                                    
                *                   Director                        May 20, 1998
- ---------------------------------   
Ted Prince                          
                                    
                *                   Director                        May 20, 1998
- ---------------------------------   
Fran Saldutti                     

*By: /s/ Fred Knoll
     ----------------------------
     Fred Knoll, Attorney-in-Fact


                                      II-4
<PAGE>


                                  EXHIBIT INDEX
                                  -------------


   Exhibit No.
   -----------

   1.1*     Form of Underwriting Agreement

   3.1*     Certificate of Incorporation of Thinking Tools, Inc.

   3.2*     By-Laws of Thinking Tools, Inc.

   4.1*     Form of Underwriter's Option Agreement

   4.2*     1996 Stock Option Plan

   4.3*     Form of Stock Certificate

   4.4*     Form of Private Placement Investors' Warrant

   4.5*     Technologies Warrant

   4.6*     Form of Private Placement Note

   4.7*     Form of Lock-up Agreement

   5.1*     Opinion of Squadron, Ellenoff, Plesent & Sheinfeld, LLP

   10.1*    Employment Agreement between the company and John Hiles

   10.2*    Form of Consulting Agreement

   10.3*    Development Agreement between the Company and Systemhouse dated 
            June 30, 1995

   10.4*    Services Agreement between the Company and Systemhouse dated 
            March 8, 1995

   10.5*    Vertical Market Software Development/Licensing Agreement
            between the Company and Coopers dated October 12, 1994

   10.6*    Technologies Agreement between the Company and Technologies dated
            September 26, 1994

   10.7*    Consent, Waiver and Amendment between the Company and Technologies
            dated August 31, 1996.

   10.8*    Lease between the Company and KI Monterey Research, Inc. dated
            August 19, 1994, as amended.


                                      II-5
<PAGE>


   23.1     Independent Auditors' Consent -- Deloitte & Touche LLP

   23.3     Consent of Squadron, Ellenoff, Plesent & Sheinfeld, LLP

   24.1*    Power of Attorney

   ------------
   * Previously filed.


                                      II-6


                                                                    EXHIBIT 23.1


                          INDEPENDENT AUDITORS' CONSENT


      We consent to the incorporation by reference in this Registration
Statement of Thinking Tools, Inc. on Form S-3 of our report dated February 2,
1998 (which expresses an unqualified opinion and includes an explanatory
paragraph concerning certain factors which raise substantial doubt about the
Company's ability to continue as a going concern), appearing in the Annual
Report on Form 10-KSB of Thinking Tools, Inc. for the year ended December 31,
1997 and to the reference to us under the heading "Experts" in the Prospectus,
which is part of this Registration Statement.



DELOITTE & TOUCHE LLP

San Jose, California
May 15, 1998





                                                                    EXHIBIT 23.3


             CONSENT OF SQUADRON, ELLENOFF, PLESENT & SHEINFELD, LLP


      As counsel to Thinking Tools, Inc., we hereby consent to the use of our
opinion dated October 16, 1997, filed with the Securities and Exchange
Commission as Exhibit 5.1 to Post-Effective Amendment No. 1 to the Registration
Statement on Form SB-2 (Registration No. 333-11321), as well as all references
to our Firm, included in or made a part of this Registration Statement on Form
S-3.


SQUADRON, ELLENOFF, PLESENT & SHEINFELD, LLP

May 18, 1998



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