PIONEER WORLD EQUITY FUND
NSAR-B, 1998-05-22
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SIGNATURE   ROBERT P. NAULT                              
TITLE       ASST. SECRETARY     
 


                               





To the Board of Trustees of
Pioneer World Equity Fund:

In planning and  performing  our audit of the  financial  statements  of Pioneer
World Equity Fund for the year ended March 31, 1998, we considered  its internal
control structure, including procedures 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 the internal control structure.

The management of Pioneer World Equity Fund is responsible for  establishing and
maintaining an internal control  structure.  In fulfilling this  responsibility,
estimates  and  judgements  by  management  are  required to assess the expected
benefits  and  related  costs  of  internal  control   structure   policies  and
procedures.  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 any internal  control  structure,  errors or
irregularities  may  occur  and may not be  detected.  Also,  projection  of any
evaluation of the structure 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 the  internal  control  structure  would not  necessarily
disclose all matters in the internal  control  structure  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 the specific internal control structure elements does not reduce to
a relatively  low level the risk that errors or  irregularities  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 the internal control  structure,  including controls over safeguarding
securities,  that we consider to be material  weaknesses  as defined above as of
March 31, 1998.

This report is intended solely for the information and use of management and the
Securities Exchange Commission.


                                                        ARTHUR ANDERSEN LLP

                                                        /S/ Arthur Andersen LLP


Boston Massachusetts
May 1, 1998



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   <NAME> PIONEER WORLD EQUITY FUND CLASS C
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          MAR-31-1998
<PERIOD-END>                               MAR-31-1998
<INVESTMENTS-AT-COST>                         35939288
<INVESTMENTS-AT-VALUE>                        43391637
<RECEIVABLES>                                  1484523
<ASSETS-OTHER>                                    3034
<OTHER-ITEMS-ASSETS>                               937
<TOTAL-ASSETS>                                44880131
<PAYABLE-FOR-SECURITIES>                        196595
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       219677
<TOTAL-LIABILITIES>                             416272
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      38238873
<SHARES-COMMON-STOCK>                            63921
<SHARES-COMMON-PRIOR>                            21934
<ACCUMULATED-NII-CURRENT>                     (149813)
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                      (1046418)
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       7421217
<NET-ASSETS>                                  44463859
<DIVIDEND-INCOME>                               542652
<INTEREST-INCOME>                                87575
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  731751
<NET-INVESTMENT-INCOME>                       (101524)
<REALIZED-GAINS-CURRENT>                      (831043)
<APPREC-INCREASE-CURRENT>                      7122175
<NET-CHANGE-FROM-OPS>                          6189608
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                         10299
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          48281
<NUMBER-OF-SHARES-REDEEMED>                       6798
<SHARES-REINVESTED>                                504
<NET-CHANGE-IN-ASSETS>                        21070029
<ACCUMULATED-NII-PRIOR>                         (2598)
<ACCUMULATED-GAINS-PRIOR>                       109019
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           366876
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1040020
<AVERAGE-NET-ASSETS>                            905976
<PER-SHARE-NAV-BEGIN>                            16.62
<PER-SHARE-NII>                                  (.11)
<PER-SHARE-GAIN-APPREC>                           3.43
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                          .17
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              19.77
<EXPENSE-RATIO>                                   2.73
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>


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