Implementation Flashcards
What happens during data conversion
Data is taken from existing system, is converted into a suitable format. Non electronic data may have to be converted to electronic form. File formats may need to be changed.
Describe one advantage of parallel running over direct changeover.
The original system is still fully operational if new system fails, results of original can be compared to new system results.
What is one drawback of parallel running over direct changeover
Parallel running is resource intensive as both old and new have to be kept operational, and parallel involves duplication of effort.
What is corrective maintenance?
Errors may not be identified until the system has been used, these errors must be debugged and the system retested.
Why is maintenance required, even when a system has been fully tested during development?
User requirements may change after system has been in use for a period of time, because of internal or external changes, in which case adaptive maintenance is necessary
System may meet user requirements, but the performance of system may require improving, possibly because of new hardware or software which can improve processing speeds, in which case perfective maintenance is necessary.
What is perfective, adaptive and corrective maintenance?
Perfective- when performance/functionality of program has to be enhanced
Adaptive- when program has to be adapted, eg to run on different operating system
Corrective- while program is being used and an error is discovered and corrected
Describe three different costs in the production of information
Hardware- The cost of purchasing computers, the cost of consumables
Software- Cost of purchasing application software licences
Personnel- Employing someone to develop the application
How can software maintenance improve the quality of a system?
Errors will be detected and corrected during corrective maintenance
The performance of software will be improved during perfective maintenance
Additional functionality will be added during adaptive maintenance
Identify four components of technical documentation
System specification, module specifications, code listings, hardware and software specifications, data dictionaries, test data, data models.
Identify four sections contained in user documentation
Installation instructions, the HW and SW configuration, user guide, help section
