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The Computer Journal 1979 22(3):270-281; doi:10.1093/comjnl/22.3.270
© 1979 by British Computer Society
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An entity/event data modelling method

K. A. Robinson *

Infotech Methods Limited, Nicholson House, Maidenhead, UK

To date, system and data modelling techniques have concentrated almost exclusively on static views of the systems being modelled. What is modelled is a time slice of a given system's existence. The system dynamics are only modelled implicitly and obscurely in the transaction consistency rules.

The explicit modelling of the system dynamics – the system behaviour – has only been attempted hitherto in simulation languages. A pioneering attempt by Jackson (1975) to show how dynamic system models such as could be define in, say SIMULA 67, can be programmed in COBOL has not received a great deal of attention. This is because it has only been applied to simple systems with a single entity type and no parallelism. This paper shows how the technique can be applied in more realistic cases.

Presented at the meeting of Group 5–Advanced Programmers on 8 March 1979.

* Infotech Methods Limited, Nicholson House, Maidenhead, Berkshire, SL6 1LD


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