Understanding and supporting the interaction between software requirements and architectures remains one of the challenging problems in software engineering research. Our aim is to be able to derive architectural models in concert with Multi-Agent System Requirements Specifications. In this paper we present an approach to derive multi-agent systems architecture from requirements using social analysis methods. It is based on two complementary models (Organisational Model and Assignment Model) that separate the requirements of the social organisation from those of the software system architecture. A process is defined to provide a systematic way to assist the transition from requirements models to an architectural configuration.