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Systems life cycle (design stage (Validation (Range check, Look-up check,…
Systems life cycle
design stage
Data capture forms
paper-based
computer-based
Screen displays and printed reports
System flowcharts
Data flows
Decisions making
Verification
Double entry
Visual check
Validation
Range check
Look-up check
Length
Character/ type check
Format/ picture check
Presence check
Consistency check
Check digit
Design and testing strategy
implementation stage
Direct
Parallel
Pilot
Phased
analysis stage
Feasibility study
Researching an existing system
Data flow diagram (DFD)
development and testing stage
Development
structure would be finalised
Trap unwanted data
Double-check the output
Testing strategies
Modular
Normal
acceptable
Extreme
at the limits
Abnormal
Live data
documentation
User documentation
how to sort data
how to save files
limitations of the system
Technical documentation
maintain the system
To help programmers
evaluation stage
compare the final solution with original task
compare test results from the new system to the old one