pGovernmental, organisational and technological developments are taking place at an increasingly rapid pace. Structures are becoming more flexible and new service and business models are necessary to maintain or improve the performance of an enterprise. This leads to an increasing need for enterprise governing capacity to allow managers to choose the right direction for an enterprise in the event of major changes, and to maintain and strengthen its coherence. ppbrppIn this book we describe how the General Enterprise Architecting GEA governing instrument is used to govern the enterprises' coherence. The central assumption of GEA is the direct relationship between the degree of coherence in an enterprise and the performance of an enterprise, making the governance of enterprise coherence a very interesting idea. Since the development of GEA, many enterprises have gained experience in applying the instrument GEA has contributed in many different ways to the managing capacity of enterprises