One of the three levels in accordance with the OMG theory: execution, description and expression
Introduction to the notion
- A level of execution – where we face real things and actions
- A level of description – the place where we find the models that describe real things
- A level of expression – that is to say the metamodel that articulates the categories of representation we use when modeling
In practice, the modeler is often faced with difficulties that stem from the mix of levels of representation. That is the reason why we have to make this notion clear.