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AbstractIn this paper, the authors propose a new methodology relative to earlier work on the Viable System Ontology Theory. This theory links Beer's Viability theory and Dietz's Performance in Social Interaction (PSI) theory and aims at supporting the business process design of a viable system. This work extends the Viable System Ontology Theory by a detailed methodology that alternates the VSM functional diagnosis and design with the construction design as recommended by the Generic System Development Process (GSDP). The proposed methodology consists of three iterative phases: the environment construction, the function design, and the construction design of a viable system. Those steps are discussed in the light of the Viable System Ontology Theory propositions. In addition, they are illustrated by the case study of the Moroccan public medicine procurement system.