In aspect-oriented model driven engineering (AOMDE), a software design model consists of a primary model that describes the business logic of the application and a set of aspect models each of which describes a crosscutting software feature. The complete design is realized by composing the primary model with the aspect models. A variety of AOMDE approaches are possible depending on how the principal tasks of the AOMDE process are interleaved. This paper presents and compares two distinct AOMDE approaches.