A model-based engineering discipline presupposes that models are organised by creating relationships between them. While there has been considerable work on understanding what it means to instantiate one model from another, little is known about when a model should be considered to be a specialisation of another one. This paper motivates and discusses ways of defining specialisation relationships between models, languages, and transformations respectively. Several alternatives of defining a specialisation relationship are considered and discussed. The paper’s main contribution is the introduction of the notions of an observer and a context in order to define and validate specialisation relationships. The ideas and discussions presented in this paper are meant to provide a stepping stone towards a systematic basis for organising models.
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