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This article describes and explains the ORCA (Object-oriented standards catch research) procedure. it's geared toward these attracted to the outline and research of advanced platforms. specifically, it's geared toward these chargeable for generating techniques for using details expertise and requisites for software program improvement. generating and interpreting versions of platforms is a chief job in ORCA and complementary modelling languages are supplied for this function. those languages are illustrated in the course of the publication.
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The client is adamant that these staﬀ should not be deskilled if at all possible—they should retain a high degree of control over the weaving process. There is dissatisfaction with the looms’ control boxes, and a desire for a more up-to-date working environment. It seems that any prescription is unlikely to be considered unless it addresses these problems. However, the client also feels that the character of the factory (dark, noisy and generally with a feel of the workhouse about it) and many of the traditional aspects of the weaving process should be retained.
The type of each constituent set is given after the colon; these types are the classes Tank , Pump and TransactionRecord shown earlier in the static models. In this case, the behaviour involves only single instances of Pump, Tank and TransactionRecord , but constituent sets can, in general, contain more than one instance. The vertical lines in the diagram are timelines. These are drawn with time progressing down the page. Timelines are used to show temporal dependency: ordering of behaviours in time.
Such IT systems are diﬀerent in nature from the ‘systems’ that are the subject of analysis. The latter kind of system is a view of what is essential about some area of the world (in both purposive and behavioural terms). IT systems are a way of implementing some aspects of essential behaviour. In the case of the petrol station, the proposed New World involves more ‘intelligent’ ordering behaviour, using information about customer transactions. This new behaviour needs to be implemented using some combination of human, physical and computational resources.