A modelling starts when for some special purposes something is needed to be modelled. This creates a basic modelling situation, which consists of 1) objects to be modelled, 2) a modeller, who is doing the modelling, 3) a model, which is to be a result of the modelling, 4) different relationships between objects, modeller, and model, and finally, of course, 5) the special purposes, i.e. the goals, of the modelling. The basic modelling situation is then a fourplace relation: M(object(x), modeller(y), model(z), purpose(v)), which is to be read: “an object x is modelled by y as z for the purpose of v.” From this definition it follows that modelling is always an intentional activity. [12] In this paper the BMS is used in two purposes. Firstly, an interview in process improvement can be seen as a basic modelling situation. Secondly, from the structure of the BMS it is possible to derive questions, which orientate us to the situation.