Service Oriented Architecture (SOA) has been developed to enhance the integration of various systems to allow organizations to be more flexible in case of business changes. This paper will explain a top-down method in which Business Process Models can lead to a basic service orientation of business functions. This will be shown based on the principles of Model-Driven Architecture (MDA). Without model support, the translation of business needs into executable code to support IT developments is rather hard and mostly impossible. In this paper, we motivate the need for this approach as a means of focusing importance on modeling, a key enabler of communication between business analysts and IT developers.