Hello,
When we start a new model, it’s a classic question to ask if this concept is a capability or a system function. In order to answer I ask this question: can I describe this concept by several scenarios or functional chains? Generally it works and sometime I have to go back; but it’s not a big deal, modelling is an iterative process
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For me in SA, Capabilities are always Capabilities of the System; they are necessary to “realize” the missions of the system (the goals of the system.