The Sensible Agent Testbed allows users to perform controlled and repeatable experiments on the performance of Sensible Agents in a distributed simulation environment. The testbed uses CORBA(R) and IDL(R) to connect modules running in C++, ModSim, Java, and Lisp on WindowsNT and Linux platforms. Users can perform initialization, monitoring, and logging of the environment or individual Sensible Agent performance as the simulation progresses. Several different scenarios are presented to demonstrate the capabilities of Sensible Agents in a Naval Radar Frequency Management domain. Sensible Agents can use Dynamic Adaptive Autonomy (DAA) to adapt the structure of their problem-solving organizations in order to handle the complex and dynamic nature of this domain. Users can view this adaptation and monitor related system and agent performance variables as the simulation runs. This technology has the potential to provide advanced multi-agent capabilities to legacy planners with a minimal recoding effort.