INDEPENDENT AUDITORS' REPORT
To the Shareholders and Board of Trustees of
Morgan Stanley Dean Witter Quality Municipal Securities Trust:
In planning and performing our audit of the financial statements
of Morgan Stanley Dean Witter Quality Municipal Securities Trust
(the "Trust") for the year ended October 31, 2000 (on which we
have issued our report dated December 8, 2000), 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, and not to provide
assurance on the Trust's internal control.
The management of the Trust 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 accounting
principles generally accepted in the United States of America.
Those controls include the safeguarding of assets against
unauthorized acquisition, use, or disposition.
Because of inherent limitations in any internal control,
misstatements due to error or fraud may occur and not be
detected. Also, projections of any evaluation of internal
control to future periods are subject to the risk that the
internal control may become inadequate because of changes in
conditions or that the degree of compliance with policies or
procedures may deteriorate.
Our consideration of the Trust's 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 the Trust's internal control and its operation,
including controls for safeguarding securities, that we consider
to be material weaknesses as defined above as of October 31,
2000.
This report is intended solely for the information and use of
management, the Shareholders and Board of Trustees of the Trust,
and the Securities and Exchange Commission and is not intended to
be and should not be used by anyone other than these specified
parties.
Deloitte & Touche LLP
New York, New York
December 8, 2000
