Agent-oriented programming (AOP) represents a new way of analysing, designing, and implementing complex software applications. This approach has been successfully used in complex applications with distributed components, which require concurrent behaviour, efficient reasoning, dependable communication, sharing and integration of knowledge. Such applications range from from comparatively small systems such as personalised email filters to large, complex, mission critical systems such as air traffic control. Since its introduction, various approaches have been proposed to determine a suitable architecture for agent-based systems. There have been a number of attempts to model AOP, some of which also involve an implemented development environment (such as JACK [1], or dMARS) whilst others are an abstract specification of necessary constructs such as Agent0 [4].