A Portuguese hospital with 700 beds and assisting 600 000 inhabitants, in its strategic plan, claimed for the urgent need of using new management approaches for dealing with the complexity of their information systems (IS), the highly coupled Information Technology (IT) infrastructures, and the inefficiency in the communication. This paper describes a proof of concept development using the concepts of Enterprise Architecture (EA) to contribute for a solution for these needs. The work focuses on the improvement of the medical appointment and patients’ customer service business processes. Based on key points of existing EA frameworks, we started by using a questionnaire to the top management, and defining a common vision for this specific area, followed by the elicitation of the business processes and the supporting IS and IT infrastructures. Finally, we selected the key performance indicators that will help the hospital to monitor the performance of these processes. With this information gathered we offer a tool for top management to communicate with the clinical and IT areas and, together, take decisions with a common mind map and with the possibility to simulate the impact in the organization of those decisions. Another result of this work is the lessons learned in this proof-of-concept that can be applied in other areas and business processes of the hospital.