NED-2 is a robust, full service Intelligent Information System designed to provide decision support for forest ecosystem management. Integrating growth and yield models into NED is one of the important elements in developing NED. NED-2 uses external heterogeneous information source management (EHISM) agents to permit communication between external sources and NED-2. FVS is the first simulation model integrated in NED-2. A meta-knowledge base is developed, so the simulation agent can use it to set up and execute the FVS models. This thesis will briefly describe the NED-2 agent-based blackboard architecture, and discuss the design issues explaining the integration of NED-2 and FVS.