22. System Design, Implementation and Operation Flashcards
Phase 2. Conceptual System Design from SDLC contains?
Tip: 1) Evaluate design alternatives, 2) prepare design specifications, 3) prepare conceptual system design report
1) Evaluating design alternatives how well does it meet the objectives and user needs, is it feasible, what are the advantages and disadvantages?
- Preparing design specifications - created for output, data storage, input,
and processing procedures - Preparing the conceptual systems design report to the steering committee.
Phase 3. Physical Systems Design from SDLC.
Tip: output design, file and database design, input design, program design, procedures design, controls design.
Explain program design
Program Design, determine user needs. • Create and document development plan. • Write the computer code. • Test the program. • Document the program. • Train (super-)users. • Install the system (including components and hardware). • Use and modify the system.
Phase 4. Systems implementation
Tip: implementation planning includes install and test hardware and train personell.
Explain test system
.Walk-throughs: Step by step review
Processing test data: Test all valid transactions and error conditions
Acceptance tests: Use copies of “real” (mask personal!) data
When you have installed, test and trained personel. You will have a complete documentation and that consist of:
Development documentation.
Operations documentation.
User documentation
Explain conversion approaches
Tip: direct, parallel, phase-in conversions
Direct conversion: Terminates the old and begins with the new system.
Parallel conversion: Operate old and new systems for a
period of time.
Phase-in conversion: Gradual replacement of old elements
with new system elements.
Pilot conversion: Implement a system in a part of an organization (e.g., a branch).
Phase 5. Operations and maintenance
Conduct post-implementation review
