Abstract
Recent efforts have been made to coalesce object-oriented methods and object-oriented modelling languages and, at the same time, to put them on a more rigorous footing by the use of metamodelling techniques. Two so-called third-generation approaches, OPEN (a full methodology) and UML (a modelling language) are described and compared here. These two approaches are compared by focusing on two main areas: (1) process and lifecycle support and, predominantly, (2) metamodel and notation.
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