Figure 2.4 showed a conceptual data model diagram for the data required to support part of a human resources function. It is a very small data model and represents only a small part of the business of a commercial enterprise. Any information system built using this data model would probably end up as what is known as a ‘small system’ – a system to support a small, clearly defined community of users. It is a data model developed purely from the perspective of the small part of the business that the information system will be developed to support. It takes no account of any corporate need to share information across the enterprise. The problems associated with developing data models ...

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