Ivan Ryant

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Many systems analysts believe that strictly following a methodology prevents them from producing incorrect system specification. In fact, banking systems, telephone exchanges and other information and control systems may fail in any moment because of hidden errors. This article explains that the most widespread methodologies nowadays aid rising of dangerous(More)
5. Sessions between the system and its external users, sessions inside the system. Interactions start, run and finish they constitute sessions on a connection between an external actors and internal objects-or just between internal objects. There is a question, how is the connection set up and how is it canceled? Particular scenarios and complete session(More)
D o squares form a subclass of rectangles? Baclawski and Indurkhya [1] explain that finding the answer is not easy. Inheritance is commonly viewed as a problem in which semantic relations mix with design concepts and the particular mechanisms of programming languages. But inheritance is more than a source of ambiguity and misunderstanding. We see another(More)
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