8.8.1 While PYTHIA supplies the recommender agents that interface with GAMS, the solver and mediator agents are provided by SciAgents system. Each solver agent is considered a "black box" by the other agents and interacts with them using interagent language. SciAgents is a mechanism for cooperation among computing agents, thus moving away from the centralised, single agency systems. The agents perform only local computations and communicate only with neighbouring agents. They cooperate in solving global, complex problems without any of them exercising centralised control over the computations. The global solution emerges in well-defined mathematical way from the local computations as a result of intelligent decision making done locally and independently by the mediator agents. (Drashansky et. al.,1999, pg. 52)