Explain three reasons why an organization may need to change to a new computerised system.
(b) State why each of the following is important in system documentation.
(i) Identify the types of computer files named above.
(ii) Give a characteristic of data held in each file.
(iii) Name the field that should be used to link the two files.
(a) Current system may be experiencing problems thereby being unable to meet organisation requirements.
New directives may be received from authorities and the organisation must comply.
Changes in the operating environment forces the organisation to change in order to fit and continue in business. e.g. competition.
Changes in technology requiring the upgrading or total change in the existing system.
Peer pressure need to remain fashion
(b) (i) Sample data should be provided so that all modules can be tested.
(ii) Output reports show that the system actually works/testing process/expected output..
(c) (i) Manual: Manual files stored in cabinets/books/paper/in-tray/out-tray.
(ii) Electronic: Secondary storage devices/individual storage devices e.g. Flash.
(d) (i) Student: Master file/Parent/Reference File/Primary.
Register: Transaction file/Child table/Secondary.
(ii) Master file: Data is static/Permanent/Semi-permanent.
Transaction file: Data is dynamic/Temporary/Changes frequently
(iii) Key field: Student number/Admission No/Reg. No/File No.
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