In the context of systems development life cycles (SDLC), a gap exists between the representations of the methodologies as processes on the one hand, for example using business process model and notation (BPMN), and the formalisms that would provide the level of analysability necessary to validate the corresponding processes on the other hand, for instance Petri nets. This doctoral thesis aims at bridging this gap by proposing a model in-between these two extremes that is simple yet expressive enough to be able to represent the processes, either directly or by translating BPMN diagrams to the...