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Several efforts have been made towards creating personal assistant software (PAS) to help people in their daily life activities, at home or at work. In spite of the complexity PASs can have, most of the works focuses on developing solutions only for very specific tasks, without supporting integration and interoperation with other systems (including other PASs) and with enterprise systems and their respective business processes. Aiming at coping with these requirements, this work presents an open reference architecture for PASs, allowing that interoperable instances can be derived, personalized, implemented and deployed according to users' profiles and to enterprises' processes. An instance of a PAS has been derived and its results are discussed.