A fast and continuously changing business environment demands flexible software systems easy to modify and maintain. Due to the extent of interconnection between systems and the internal quality of each system many IT-decision makers find it difficult predicting the effort of making changes to their systems. To aid IT-decision makers in making better decisions regarding what modifications to make to their systems, this paper proposes extended influence diagrams and enterprise architecture models for maintainability analysis. A framework for assessing maintainability using enterprise architecture models is presented and the approach is illustrated by a fictional example decision situation.

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