SISCO: An object-oriented supply chain simulation system. We present SISCO, the Simulator for Integrated Supply Chain Operations, an object-oriented supply chain simulation tool. SISCO advances the concept of a supply chain simulator in a number of ways. With SISCO, we introduce a fundamentally new approach to supply chain specification, storage, and model generation. The user specifies the structure and policies of a supply chain with a GUI-based application and then saves the supply chain description in the open, XML-based Supply Chain Modeling Language (SCML) format. SISCO automatically generates the simulation model when needed by mapping the contents of the SCML file to a library of supply-chain-oriented simulation classes. SISCO’s object-oriented, agent-style system architecture and detailed output improve upon current supply chain simulation tools.