Situational Method Engineering for constructing ad-hoc agent oriented design process is grounded on a well defined set of phases that are principally based on reuse of components coming from existing agent design processes that have to be stored in a repository. The identification and extraction of these components could take large advantage from the existence of a standardized representation of the design processes they come from. In this paper we illustrate our solution based on SPEM 2.0 specifications for modelling agent design processes and extending them when necessary to meet specific needs we faced in our experiments.