Management’s Report on Internal Control Over Financial Reporting
Schlumberger management is responsible for establishing and maintaining adequate internal control over financial
reporting as defined in Rule 13a–15(f) of the Securities Exchange Act of 1934, as amended. Schlumberger’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.
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.
Schlumberger management assessed the effectiveness of its internal control over financial reporting as of
December 31, 2011. In making this assessment, it used the criteria set forth by the Committee of Sponsoring
Organizations of the Treadway Commission (COSO) in Internal Control—Integrated Framework. Based on this
assessment Schlumberger’s management has concluded that, as of December 31, 2011, its internal control over
financial reporting is effective based on those criteria.
The effectiveness of Schlumberger’s internal control over financial reporting as of December 31, 2011, has been
audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report
which appears herein.
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