3M 2009 Annual Report Download - page 52

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46
Report of Independent Registered Public Accounting Firm
To the Stockholders and Board of Directors of 3M Company:
In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material
respects, the financial position of 3M Company and its subsidiaries (the “Company”) at December 31, 2009 and
2008, and the results of their operations and their cash flows for each of the three years in the period ended
December 31, 2009 in conformity with accounting principles generally accepted in the United States of America.
Also in our opinion, the Company maintained, in all material respects, effective internal control over financial
reporting as of December 31, 2009, based on criteria established in Internal Control - Integrated Framework issued
by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management
is responsible for these financial statements, for maintaining effective internal control over financial reporting and for
its assessment of the effectiveness of internal control over financial reporting, included in “Management’s Report on
Internal Control Over Financial Reporting” in the accompanying index. Our responsibility is to express opinions on
these financial statements and on the Company’s internal control over financial reporting based on our integrated
audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight
Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance
about whether the financial statements are free of material misstatement and whether effective internal control over
financial reporting was maintained in all material respects. Our audits of the financial statements included 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. Our audit of internal control over financial reporting included obtaining an understanding of
internal control over financial reporting, assessing the risk that a material weakness exists, and testing and
evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also
included performing such other procedures as we considered necessary in the circumstances. We believe that our
audits provide a reasonable basis for our opinions.
As discussed in Note 1 to the consolidated financial statements, the Company changed the manner in which it
accounts for uncertain tax positions in 2007. Also as discussed in Note 1 to the consolidated financial statements,
the Company retrospectively changed the manner in which it accounts for noncontrolling interests in consolidated
subsidiaries and certain convertible debt instruments in 2009.
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.
/s/ PricewaterhouseCoopers LLP
Minneapolis, Minnesota
February 16, 2010