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By B. Walraet (Auth.)

This finished method of the construction of software program platforms charts a street via procedure modelling strategies, permitting software program engineers to create software program assembly very simple specifications: to begin with, that the software program approach represents a slender emulation of the association process that served as its version; and secondly that the software program procedure screens existence attributes similar to these of the association approach that it automatizes. the result's a quantum jump bring up in software program software caliber. Such profit is accomplished via the advent of a primary paradigm: the office-floor metaphor which includes such well-balanced simple principles because the useful normalization of initiatives and knowledge (in sharp distinction to the vintage information normalization) and the primary of tenant-ownership

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At the linguistic level, the process that takes place is one of gathering information from the sources that may exist (the end user for instance) and cleaning it up, ridding it of redundancies, contradictions and ambiguities. The next level, the conceptual level, represents a work 11. Due to the aforementioned vicious circle, the implemented software system will help in maintaining the consensus. Conversely, breaches in the consensus will contribute to the fast obsolescence of the system. 12. This principle is strongly enforced in an information modeling technique devised by Philips (the Netherlands): INFOMOD.

And if there are many of these in a table, they constitute candidate keys. A problem of choice: only one of them is really to be used as true primary key, the others may be demoted as alternate keys. According to Codd, a relation's tuples should be unordered. It is irrelevant to know that the row with key value ANC is the 768th one, and it is just as irrelevant that therefore row 769 has some specific related meaning. Rows should be inter­ changeable, without effect upon the applications using them.

By placing the responsibilities in that way, even at this macroscopic level, a feeling of concern should prevail and this will be instrumental in improving the quality of the system. The notion of responsibility through ownership is refined in virtually every chapter of this book. Design revisited or divide and conquer Involved as the analysis of a problem to be solved may be, the design of a solution is even more complicated an activity. During the design phase, one essentially decomposes a problem into sub-problems, each one of them being decomposed again until manageable units are obtained which we can start implementing.

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