2.4 Software Engineering Phases
There are four basic phases of software development that are shown in Figure 4. Vision: Here we determine why are we doing this thing and what are our business objectives that we want to achieve.
Definition: Here we actually realize or automate the vision developed in first phase. Here we determine what are the activities and things involved.
Development: Here we determine, what should be the design of the system, how will it be implemented and how to test it.
Maintenance: This is very important phase of software development. Here we control the change in system, whether that change is in the form of enhancements or defect removal.
Maintenance
Correction, adaptation, enhancement
For most large, long lifetime software systems, maintenance cost normally exceeds development cost by factors ranging from 2 to 3.
Boehm (1975) quotes a pathological case where the development cost of an avionics system was $30 per line of code but the maintenance cost was $4000 per instruction
There are four basic phases of software development that are shown in Figure 4. Vision: Here we determine why are we doing this thing and what are our business objectives that we want to achieve.
Definition: Here we actually realize or automate the vision developed in first phase. Here we determine what are the activities and things involved.
Development: Here we determine, what should be the design of the system, how will it be implemented and how to test it.
Maintenance: This is very important phase of software development. Here we control the change in system, whether that change is in the form of enhancements or defect removal.
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| Software Engineering Phases - Click to Enlarge |
Correction, adaptation, enhancement
For most large, long lifetime software systems, maintenance cost normally exceeds development cost by factors ranging from 2 to 3.
Boehm (1975) quotes a pathological case where the development cost of an avionics system was $30 per line of code but the maintenance cost was $4000 per instruction
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