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<PAGE> PAGE 2
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<PAGE> PAGE 3
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<PAGE> PAGE 10
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<PAGE> PAGE 11
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<PAGE> PAGE 13
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SIGNATURE SUSAN A. TRONEL
TITLE MANAGER
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To the Shareholders and
Trustees of Vanguard Bond Index Funds
In planning and performing our audit of the financial statements of
Vanguard Bond Index Funds (the "Fund") for the year ended December 31,
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 December 31, 1999.
This report is intended solely for the information and use of management
and the Board of 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
February 9, 2000
Attachment for Vanguard Bond Index Funds
Old Policy:
Besides investing in fixed-income securities comprising its
target index, each Fund may invest up to 20% of its assets in short-
term money market instruments and certain derivatives in order to
manage cash flow into and out of the Fund.
New Policy:
Besides investing in fixed-income securities comprising its
target index, each Fund may invest up to 35%, 20% in the case of
Total Bond Index Fund, in fixed income securities not in the target
index. The Funds may purchase non-public, investment-grade
securities, generally referred to as 144A securities, as well as
smaller public issues or medium-term notes not included in the
index due to the small size of the issues. The vast majority of these
securities will have characteristics and risks similar to those in the
target indexes. The Short-Term, Intermediate-Term, and Long-
Term Bond Index Funds may also purchase securities that are
outside of their target indexes, but are within the larger Lehman
Brothers Aggregate Bond Index. Each Fund may also purchase
money market instruments and certain derivatives in order to manage
cash flow into and out of the Fund, reduce the Fund's transaction
costs, or add value when these instruments are favorably priced.
Summary:
1. For Short-, Intermediate-, and Long-Term Bond Index Funds, the
limitation has increased to 35% of its assets in securities not in its
target index.
2. The Funds' policy on "Other Investments" has been broadened
from "cash and certain derivatives" to include "non-public,
investment-grade securities" and "smaller public issues or
medium term notes".
