Chapter 6 Flashcards
Describes functional requirements of a system
Logical design
Specifies the characteristics of the system components necessary to put the logical design into action
Physical design
Environmental Design Considerations (3)
- slash power consumption
- require less physical space
- disposed in a way that doesn’t negatively affect the environment
Decision-making group is appointed and given the responsibility of making the final evaluation and selection
group consensus
Lists the costs and benefits of each proposed system
Cost/benefit analysis
An examination that compares computer systems operating under the same conditions
Benchmark test
Evaluation process in which each evaluation factor is assigned a weight, in percentage points, based on importance
Point evaluation
Combines software from various vendors into a finished system
Commercial off-the-shelf (COTS)
Allows businesses to subscribe to Web-delivered application software by paying a monthly service charge
Software as a Service (SaaS)
A blend of hardware and software
databases
Cutover stages
Direct, phase in, pilot, parallel
Stopping the old system and starting the new system on a given date.
High risk approach – because of the potential for problems and errors when the old system is shut off and the new system is turned on at the same instant.
Direct conversion
Components of new system are slowly phased in while components of the old one are slowly phased out.
Can take several months
Phase in approach
Involves running the complete new system for 1 group of users rather than all users.
Pilot start-up
running both old & new systems for a period of time.
Performance & output of new system is compared closely with the old system and any differences will be solved and made consistent with each other
Parallel Start-up
Triggered by a problem or opportunity
Event-driven review
Performed after a specified amount of time
Time-driven review
