Module 5.6.3

1. Module 5.6.3 Implementing Computer-based Information Systems

2. Steps Involved in Producing a Purpose Built Computer Based Information System • Describe the steps involved in producing a purpose-built computer-based information system • This is a repeat of the systems life cycle: • Analysis • Design • Code • Test • Implement

3. Costs, Advantages and Disadvantages of Off-the-Shelf Software • Costs • One off purchase cost • Maintenance costs if required • Changing work practices to cope with requirements of new software (the software cannot change so the practices must) • Costs involved in creating modules. Macros, etc to customise software to meet requirements • Advantages • Immediate availability • Support • Internet, books, specialists • Existing users of the software can be sought out and questioned as to its suitability, flaws, bugs, etc • Rigorous Testing • Variety of people an a variety of systems • Most of the bugs removed • Disadvantages • Large memory footprint • Lots of additional features not required • Can be tied in to a proprietary file format • Not designed for your situation – may be difficult or impossible to alter • May require changes in current practices • May not integrate with existing systems

4. Costs, Advantages and Disadvantages of Purpose-Built Software • Costs • Development and coding costs • Single organisation for maintenance • Advantages • Suits the purpose completely • Direct support from Author • Can be easily altered to meet changes in situation • Code owned and can be sold on • Disadvantages • Time of development • Testing may not be completely sufficient – different platforms, etc • Training and external support is limited