In the globalization era, competition pace among the industry has been becoming faster. This leads in changes on business process of many companies, including companies in Indonesia. Implementing international standards for management system becomes a critical step and decision for the companies in order to survive in the competition. This research will find the impact of requirements in the integrated management systems on the company operational performance. The object will be 30 manufacturing companies in Indonesia which have implemented the integrated management system. Literature study is conducted to show requirements shared in the integrated management system and operational performance criteria. Structural Equation Modeling will be used in order to analyze the relationship between requirements stated in three standards of ISO 9001, the ISO 14001, and OHSAS 18001 with operational performance criteria. The result of this research shall find the best strategies in implementing these systems specifically for Indonesian manufacturing industries in order to optimize the operational performances.