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By Hardcastle E.

This loose textbook presents an summary of commercial details structures and offers definitions for different structures utilized in businesses.

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Quality measured by closeness of product to specification. This is a fundamental difficulty – the observation that ‘the system does exactly what the specification said it would do’ hides the fact that the system may still not deliver the information that the users need for decision-making purposes. The real focus should be on a comparison of the deliverables with the requirements, rather than of deliverables with a specification that was a reflection of a perceived need at a particular point in time.

Rapid applications development (RAD) is a method of developing information systems which uses prototyping to achieve user involvement and faster development compared to traditional methodologies such as SSADM. com 38 Business Information Systems Systems Development Methodologies Prototyping produces a preliminary version of part or a framework of all of an information system which can be reviewed by end-users. Prototyping is an iterative process where users suggest modifications before further prototypes and the final information system are built.

The second technique involves overwriting the virus program so that it is permanently and irrevocably deleted from the disk. The third and final method of removing a virus is by restoring a backup of the infected disk to the system. The process of writing files to the disk effectively overwrites the virus and restores the system to its original state. Despite the sophistication of scanning programs, none is capable of offering complete protection against infection. Many tests have been carried out to determine the efficiency of specific virus-scanning programs.

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