Sonic 2006 Annual Report Download - page 57

The Board of Directors and Stockholders of
Sonic Corp.
We have audited management’s assessment, included in the accompanying Management’s Report on Internal
Control Over Financial Reporting, that Sonic Corp. maintained effective internal control over financial reporting as of
August 31, 2006, based on criteria established in Internal Control—Integrated Framework issued by the Committee of
Sponsoring Organizations of the Treadway Commission (the COSO criteria). Sonic Corp.’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 an opinion on management’s assessment and an
opinion on the effectiveness of the company’s internal control over financial reporting based on our audit.
We conducted our audit 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. Our audit included
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 considered necessary in the circumstances.We believe that our audit provides a reasonable basis for our opinion.
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 (1) pertain to the maintenance of records that, in reasonable detail,
accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) 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 (3) 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.
In our opinion, management’s assessment that Sonic Corp. maintained effective internal control over financial
reporting as of August 31, 2006, is fairly stated, in all material respects, based on the COSO criteria. Also, in our opinion,
Sonic Corp. maintained, in all material respects, effective internal control over financial reporting as of August 31, 2006,
based on the COSO criteria.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board
(United States), the consolidated balance sheets of Sonic Corp. as of August 31, 2006 and 2005, and the related
consolidated statements of income, retained earnings, and cash flows for each of the three years in the period ended
August 31, 2006 of Sonic Corp. and our report dated October 27, 2006 expressed an unqualified opinion thereon.
Oklahoma City, Oklahoma
October 27, 2006
Sonic Corp. 2006 Annual Report
55
Report of Independent Registered
Public Accounting Firm on
Internal Control Over
Financial Reporting