Abstract: The simulation model knowledge base of CIM consists of five parts: FBS model of CIMOSA system architecture, entity class library, procedural knowledge base, database and inference engine. This knowledge based simulation model is represented by object oriented frame language and its behaviour is generated by inference engine reasoning procedural rule sets. Because of using various class libraries which make this system flexible it is called a knowledge-based integrated manufacturing flexible simulation system.

Key words: Flexible, Integrated manufacturing, knowledge-based simulation model