Conceptional modelling is one of the central activities in Computer Science. Conceptual models are mainly used as intermediate artifact for system construction. The notion of the conceptual model is at present rather informal. Conceptional modelling is performed by a modeller who directs the process based on his/her experience, education, understanding, intention, and attitude.

This paper develops a definition of the model and the conceptual model that encompasses model notions used in Computer Science, Mathematics, Natural and Social Sciences, and Humanities. Models are artifacts which have a background, a basis, and a context. They are products that are used by community of practice such as programmers, learners, business users, and evaluators. Models must be adequate for the representation of origins, faithful for their signification, functional; thus providing the necessary capability and be able to provide effective deployment.