Maturity models are a well-known instrument to support the improvement of functional domains in IS, like software development or testing. While maturity models may share a common structure, they have to be developed anew for each functional domain. Focus area maturity models are distinguished from fixed-level maturity models, like CMM, in that they are especially suited to the incremental improvement of functional domains. In this paper we present a generic method for developing focus area maturity models based on both extensive industrial experience and scientific investigation. In doing so, we show two examples of focus area maturity models, one for enterprise architecture and one for software product management. We used a design science research process to develop the method presented.