Alcoa 2013 Annual Report Download - page 100

Report of Independent Registered Public Accounting Firm
To the Shareholders and Board of Directors of Alcoa Inc.
In our opinion, the accompanying consolidated balance sheet and the related statements of consolidated operations,
consolidated comprehensive loss, changes in consolidated equity, and consolidated cash flows present fairly, in all
material respects, the financial position of Alcoa Inc. and its subsidiaries (the “Company”) at December 31, 2013 and
2012, and the results of their operations and their cash flows for each of the three years in the period ended
December 31, 2013 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, 2013, based on criteria established in Internal Control—Integrated Framework (1992) 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 the accompanying
Management’s Report on Internal Control over Financial Reporting. 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.
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
Pittsburgh, Pennsylvania
February 13, 2014
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