摘要:Keyword: Keyword : Internal ControlAbstrack:ABSTRACTThe development of a company implicated in the occurrence of events and new problems for the company. Therefore, then the firm are in need of an effective internal control system and integrated.The company's auditors should assist the directors and company management in member of certainty for the records and financial statements of the company carried out correctly, and management felt it necessary to know that the control run satisfactorily in all fields of activity.This research was conducted to assess the company's internal control system in terms of the internal audit function of position and audit process itself with COSO method approach, the data used is the primary data obtained from questionnaires. The questionnaire used is closed with a choice of answers Yes and No and distributed to employees of head office of PT. INDOSAT. Calculation Method of questionnaire data processed by Champion (1990, 302).