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SYSTEM FUNDAMENTALS - Coggle Diagram

- - - - Keep both and develop them (high cost)
      - Replace both (increased initial cost)
      - Select best information system (difficult for the merged company’s employees to adjust)
      - Select one company’s information and drop the other’s (policy issues)
  - - - A locally hosted system is the most appropriate solution for larger and complex systems.
      - A remotely hosted system is most appropriate where there is no necessary hardware equipment in place or when administration wishes to outsource responsibilities.
  - - - Parallel, both systems work in parallel for a short time, limited risk, can be reverted, extra costs and workloads
      - Big Bang or Direct, very risky, system must not be in critical condition, all users need to be trained appropriately
      - Pilot, introduced in one site and extended to other sites, low risk, pilots can serve as models, after one pilot site is successful, it is implemented into the rest of the company
      - Phased, the company converts one module at a time, training period is extended and adoption takes longer.
  - - - Validation is the process of evaluating whether data input follows appropriate specifications and is within reasonable limits
      - Verification - process of ensuring data input is the same as original source of data
      - Software testing = confirmation that a computer product meets identified specifications, while validation is the confirmation that a computer product meets its function or is appropriate for use.
  - - - Programs and systems become increasingly complex, additionally, the user’s way of thinking may differ from the developers so their functions may not be that clear. This may affect the Software Life cycle. If there is a user manual, issues can easily be avoided.
    - - It can be in written form or online form. It should include all the instructions, and should be well structured.