Michael Prasse

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Zusammenfassung Peter Wegner vertritt einen Berechenbarkeitsbegriff, der vom klassischen abweicht, wie er von Church, Kleene, Markov, Post, Turing und anderen etabliert wurde. Insbesondere umfassen Wegners Ideen die Interaktion als grundlegende Eigenschaft heutiger Systeme. In dieser Arbeit erfolgt ein Vergleich der beiden verschiedenen Auffassungen sowie(More)
Peter Wegner's definition of computability differs markedly from the classical term as established by Church, Kleene, Markov, Post, Turing et al. Wegner identifies interaction as the main feature of today's systems which is lacking in the classical treatment of computability. We compare the different approaches and argue whether or not Wegner's criticism is(More)
The following article is motivated by the current efforts of the Object Management Group (OMG) to standardize object-oriented modelling languages. In the face of the great economic importance of such a standardization, a careful consideration of possible requirements for modelling languages is necessary. The development of suitable criteria and measures is,(More)
A primary purpose of the current study was to consider menu "depth" (i.e., number of levels) versus menu "breadth" (i.e., number per level) in a multiwindow display. For example, a study by Miller (1981) (cited by Shneiderman, 1986) found that eight item menus with a depth of two levels resulted in the fewest errors and fastest retrieval of a designated(More)
The ObjectLens framework of VisualWorks maps objects to tables. This mapping is described in a data mapping model, which itself is specified in one dataModelSpec method. This method is mono-lithic and defines the whole data model of an application. This is a suitable approach to start with. However, when the business area extends to a set of similar(More)
Seven users did four tasks 2 For each task, users engaged in a Think Aloud protocol while conducting the task, and had their eye-fixations recorded. At the end of all tasks, the users were also interviewed. on both Worldcat.org (" WorldCat ") and Books. Google.com (" GoogleBooks "). The tasks represented a combination of Search Type (Known-item or(More)
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