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A number of steps together characterising a method according to which one may employ the Vienna Development Method, VDM, are formulated and briefly illustrated. The paper is a summary of the methodological aspects of VDM as espoused in the author's recent books: Software Architectures and Programming Systems Design, vols. I–III incl. Only specification facets will be illustrated. A subsequent paper will similarly overview the implementation facets of function transformation and data reification.

Towards a meaning of ‘M’ in VDM