Business Process Improvement (BPI) is a key issue in the development of the enterprise competitiveness. However, achieving a level of software development performance that matches enterprise BPI needs in terms of producing noticeable results in small amounts of time requires the existence of a comprehensive and also agile Software Development Process (SDP). Quite often, SDPs do not deliver software architectures that can be directly used for in-house development, as specifications are either too close to the user interface design or too close to business rules and application domain modeling, and produce architectures that do not cope with software development concerns. In this paper we present the Goals Approach, which structures business processes to extract requirements, and methodologically details them in order to specify the user interface, the business logic and the database structures for the architecture of a BPI. Our approach aims in-house software development in small and medium enterprises.