Method Engineering is defined as the construction of an information systems development (ISD) approach which is customized to suit the actual project situation. Customizing an ISD-approach to suit the actual situation in most cases means that more than one design method or parts thereof are used. Selecting and especially combining (parts of) methods is one of the main topics in the field of Method Engineering. This paper is intended to serve as a contribution in the effort to solve this problem. It describes the MEMA-model as an approach for Method Engineering.