DuPont 2006 Annual Report Download - page 66

Report of Independent Registered Public Accounting Firm
To the Stockholders and the Board of Directors of
E. I. du Pont de Nemours and Company:
We have completed integrated audits of E. I. du Pont de Nemours and Company’s consolidated financial statements and of
its internal control over financial reporting as of December 31, 2006 in accordance with the standards of the Public
Company Accounting Oversight Board (United States). Our opinions, based on our audits, are presented below.
Consolidated financial statements and financial statement schedule
In our opinion, the consolidated financial statements listed in the index appearing under Item 15(a)(1) present fairly, in all
material respects, the financial position of E. I. du Pont de Nemours and Company and its subsidiaries at
December 31, 2006 and December 31, 2005, and the results of their operations and their cash flows for each of the three
years in the period ended December 31, 2006 in conformity with accounting principles generally accepted in the United
States of America. In addition, in our opinion, the financial statement schedule listed in the index appearing under
Item 15(a) (2) presents fairly, in all material respects, the information set forth therein when read in conjunction with the
related consolidated financial statements. These financial statements and financial statement schedule are the responsibility
of the Company’s management. Our responsibility is to express an opinion on these financial statements and financial
statement schedule based on our audits. We conducted our audits of these statements in accordance with the standards of
the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the
audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit of
financial statements includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates made by management and evaluating the
overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
As discussed in Note 1 to the consolidated financial statements, the Company changed its accounting for defined benefit
pension and other postretirement plans during 2006 and for the consolidation of variable interest entities during 2004.
Internal control over financial reporting
Also, in our opinion, management’s assessment, included in “Management’s Report on Internal Control Over Financial
Reporting” appearing on page F-2, that the Company maintained effective internal control over financial reporting as of
December 31, 2006 based on criteria established in Internal Control — Integrated Framework issued by the Committee of
Sponsoring Organizations of the Treadway Commission (COSO), is fairly stated, in all material respects, based on those
criteria. Furthermore, in our opinion, the Company maintained, in all material respects, effective internal control over
financial reporting as of December 31, 2006, based on criteria established in Internal Control — Integrated Framework
issued by the COSO. The Company’s management is responsible for maintaining effective internal control over financial
reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to
express opinions on management’s assessment and on the effectiveness of the Company’s internal control over financial
reporting based on our audit. We conducted our audit of internal control over financial reporting in accordance with the
standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and
perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was
maintained in all material respects. An audit of internal control over financial reporting includes obtaining an
understanding of internal control over financial reporting, evaluating management’s assessment, testing and evaluating the
design and operating effectiveness of internal control and performing such other procedures as we consider necessary in
the circumstances. We believe our audit provides a reasonable basis for our opinions.
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and
procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the
transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded
as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles and
that receipts and expenditures of the company are being made only in accordance with authorizations of management and
directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized
acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also,
projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
PricewaterhouseCoopers LLP
Philadelphia, Pennsylvania
February 23, 2007
F-3