Simulation, situational modeling and expert systems are used in modeling, analysis and synthesis of organizational-technical systems and business processes. Multi-agent resource conversion processes theory may be used for organizational-technical systems definition from decision support point of view, a dynamic component of business processes, expert systems, situational modeling and multi-agent systems. The paper presents development principles and technical decisions of designed object-oriented multi-agent resource conversion processes based decision support system, relying on multi-agent resource conversion process model and multi-agent architecture. © 2011 IADIS.