The aim of the paper is to extend the agent oriented software engineering methodology MASITS that was initially developed for agent based Intelligent Tutoring System (ITS) development to make it usable for other agent oriented system development. The paper analyses the steps of the methodology, finds the specific ones that are either adapted to ITS characteristics or use particular artefacts from ITS research. Three extensions of the methodology have been developed, namely, a general holonic architecture, agent definition method and interaction design method. As a result, the extended version of the methodology can be used for agent oriented system development in case the system has similar characteristics to agent based ITSs. Case study of the insurance policy market automation software is used to validate the use of the extended version in the development of other kind of systems than ITSs.