Agent-based systems have evolved during the last two decades. To support the
development of such systems, agent-oriented methodologies have emerged. In general,
most of the methodologies have originated from two major research domains, namely
software engineering and artificial intelligence, and were adjusted to address the agent
abstraction. It seems that many of the methodologies share a common basis, an observation
that calls for unification and for standardization. In this chapter, we survey existing agent …