Operational architecture, or equivalently operational analysis, intends to precisely understand the interactions among time between the system of interest and the external systems of its reference environment, or equivalently of its stakeholders. Motivations of environment architecture, as already discussed in subsection 3.1, also apply in the same terms – mutatis mutandis – to operational architecture. Exactly as for stakeholder identification, any forgetfulness, misunderstanding or error that could occur during the operational architecture process may indeed have disastrous and costly consequences on a system under development...