Nowadays there are systems to enact processes, but only technology is not enough to help software processes achieve their goals, specially those related to product quality, costs and schedule. Before process enactment, it is necessary to define and represent process models so that they reflect business aspects, are understood by all stakeholders, and are adjusted to software development processes and software factories characteristics. To correspond to these criteria, in this paper a method is proposed aiming to define an object oriented process architecture. This method helps to define process models that can be specialized to meet the needs of distinct organizations and software development processes. The result of this research is a method composed of a set of activities divided into phases to define process models at distinct abstraction levels.