The paper addresses some misconceptions of Software Engineering, requirements analysis and modelling in particular, due to underlying epistemological flaws., e.g. the believe that the system analyst\u27s task be simlar to that of a natural scientist\u27s. The fundamental issues, constitution of objects and signs, conceptualization and definability, are discussed. It comes out that the paradoxical situation of software engineering is having to formalize what cannot be formalized. This is reflected in the fuzzy notion of \u27model\u27 in general as well as in the epistemological presumptions of \u27object oriented modelling\u27 in particular. The paradigm of \u27objective modelling\u27 has to be replaced by a paradigm of \u27purposive descrip...
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