Parameterization of object-classes is an attractive approach during implementation of an object-oriented software system. This text discusses different cases of possible parameterization in the implementation of geometry object-classes when used to describe location and extent of geographic features. This approach has obvious advantages and disadvantages and should be used with prudence. When t...

There is a need to use object orientation to analyse work practices. This should be done based on a social theory on how computers mediate the work arrangement. This paper presents a conceptual framework based on activity theory in which two main schools of object oriented modelling are explained. Thus, several object oriented analysis approaches may be combined and contribute to more powerful ...

With Simula 67 Ole-Johan Dahl and Kristen Nygaard invented object-oriented programming. This has had an enormous impact on program development tools and methods in the world, well accounted in conferences and books, on programming languages and object-oriented programming, and on software pioneers. Early influenced were computer scientists in the Nordic countries who from about 1970 had Simula ...

Code reuse between different object model implementations is rare. Most object models cannot easily be shared because they are implemented at a lower level of abstraction than that of the language in which they are designed to operate, rendering their semantics opaque and unavailable for modification by end users. We show that three object types and four methods are sufficient to bootstrap an o...