ABSTRACT:- Manage the uncertainty and vagueness of the construction organizations performance (COP) is the appropriate tool to improve the quality and environmental aspects. Because of the benefits of their interaction, the two systems were integrated to formulate the basis for the Integrated Management System (IMS). Quality performance has been assessed to monitor the construction processes and activities status. The developed Evaluating System has been utilized different assessment criteria, sub-criteria, and their combinations. The concepts of fuzzy set theory have been introduced to represent the uncertainty and vagueness of each system requirements. The study context is limited to construction projects to point out the using of these concepts for analyzing and improving the quality culture in this sector. The findings reflect the relative significance and the probability of fail for each article of the system components, the ability of integration for two or more systems; also some recommendations have been suggested for further development.Keywords:- Environmental system, integration management, Quality system, construction management