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SIGNATURE BARRY FINK
TITLE VICE PRESIDENT
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</TABLE>
Report of Independent Accountants
To the Shareholders and Trustees of
Morgan Stanley Dean Witter Convertible Securities Trust
In planning and performing our audit of the financial statements
of Morgan Stanley Dean Witter Convertible Securities Trust (the
"Fund") for the year ended September 30, 1999, we considered its
internal control, including control activities for safeguarding
securities, in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and
to comply with the requirements of Form N-SAR, not to provide
assurance on internal control.
The management of the Fund is responsible for establishing and
maintaining internal control. In fulfilling this responsibility,
estimates and judgments by management are required to assess the
expected benefits and related costs of controls. Generally,
controls that are relevant to an audit pertain to the entity's
objective of preparing financial statements for external purposes
that are fairly presented in conformity with generally accepted
accounting principles. Those controls include the safeguarding
of assets against unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors or
fraud may occur and not be detected. Also, projection of any
evaluation of internal control to future periods is subject to
the risk that it may become inadequate because of changes in
conditions or that the effectiveness of the design and operation
may deteriorate.
Our consideration of internal control would not necessarily
disclose all matters in internal control that might be material
weaknesses under standards established by the American Institute
of Certified Public Accountants. A material weakness is a
condition in which the design or operation of one or more of the
internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud in
amounts that would be material in relation to the financial
statements being audited may occur and not be detected within a
timely period by employees in the normal course of performing
their assigned functions. However, we noted no matters involving
internal control and its operation, including controls for
safeguarding securities, that we consider to be material
weaknesses as defined above as of September 30, 1999.
This report is intended solely for the information and use of
management and the Trustees of the Fund and the Securities and
Exchange Commission and is not intended to be and should not be
used by anyone other than these specified parties.
PricewaterhouseCoopers LLP
New York, New York
November 10, 1999
<TABLE>
<CAPTION>
EXHIBIT 77(O) MORGAN STANLEY DEAN WITTER CONVERTIBLE SECURITIES TRUST
10f-3 transactions for the period April 1, 1999 - October 20, 1999
<S> <C> <C> <C> <C> <C> <C> <C>
TOTAL
ISSUED/
DATE PRICE SHARES % of PRINCIPAL PURCHASED
SECURITY PURCHASED SHARE PURCHASED Assets AMOUNT BY FUND BROKER(S)
Adelphia Communications
04/26/99 $200.00 15,000 1.159% $500,000,000.00 0.600% Salomon Smith Barney
Conexant 05/07/99 $100.00 2,000 0.077% $350,000,000.00 0.057 CS First Boston
Interpublic Group 05/26/99 $83.02 2,000 0.064% $313,000,000.00 0.064% Salomon Smith Barney
ITC DeltaCom 05/06/99 $100.00 1,000 0.039% $100,000,000.00 0.100% CS First Boston
Nextel 06/11/99 $100.00 2,000 0.077% $500,000,000.00 0.040% CS First Boston
Seagram 06/15/99 $50.13 40,000 0.775% $927,312,500.00 0.870% Goldman Sachs
Tribune 04/07/99 $157.00 20,000 1.213%$1,256,000,000.00 0.016% Merrill Lynch
Wellpoint Health Networks
06/28/99 $67.17 1,500 0.039% $299,000,000.00 0.050% CS First Boston
American Tower 09/29/99 $100.00 1,500 0.064% $300,000,000.00 0.050% CS First Boston
American Tower 09/29/99 $70.52 2,000 0.060% $425,500,000.00 0.047% CS First Boston
Georgia Pacific 07/01/99 $50.00 60,000 1.273% $862,500,000.00 0.696% Goldman Sachs
Lamar Advertising 08/04/99 $100.00 1,500 0.064% $287,500,000.00 0.052% Salomon Smith Barney
Level 3 Communications
09/14/99 $100.00 500,000 0.212% $750,000,000.00 0.067% Salomon Smith Barney
McLeod USA 08/06/99 $250.00 12,000 1.273% $287,500,000.00 1.043% CS First Boston
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