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In this work, we present an automatic-code generation process from conceptual models. This process incorporates the use of design patterns in OO-Method [9], an automatic software production method, which is built on a formal object-oriented model called OASIS [10]. Our approach defines a precise mapping between conceptual patterns, design patterns and their implementation. Design patterns make code generation process easy because they bring the problem space to the solution space. In order to understand these ideas, we introduce a complete code generation of conceptual models that have player/role relationships. This proposal can be incorporated into CASE tools, making the automation of the software production process feasible.