We justify in the Proof of Concept period that our proposed solution is correct. The goal is to evolve a model showing clearly that the problem can be solved with the resources and within the time frame available. This is not a prototype nor an alpha version, it is only a model to avoid that, after the development has started already and we have put a significant amount of energy and time into it, eventually it turns out that our theoretical solution is not suitable for the case. The development itself only begins after we have proved that our concept is correct.