V-MODEL
Ø Just
like the WFM, the V-shaped life cycle is a sequential path of execution of
process
Ø Each
phase must be completed before the next phase begins.
Ø Testing
is emphasized in this model more.
Ø The
testing procedures are developed early in the life cycle before any coding is
done, during each of the phases preceding implementation.
Ø Requirements
begin the life cycle just like the WFM. Before development is started, a system
test plan is created. The test plan focuses on meeting the functionality
specified in the requirements gathering.
Ø The
design phase focuses on system architecture & design. An integration test
plan is created in this phase as well in order to test the piece of s/w systems
ability to work together.
Ø The
low Level Design (Coding) phase is where the actual s/w component are designed
& unit tests are created in this phase as well.
Ø Once
Coding is completed, the path of execution continues up the right side of the
V, where the test plans developed earlier are now put to use.
ADVANTAGES
1) Simple
& easy to use.
2) Each
phase has specific deliverables.
3) Higher
chance of success over the WFM due to the development of test plans early on
during the life cycle.
4) Works
well for small projects where requirements r easily understood.
DISADVANTAGES
1)
Very rigid, like WFM(It needs lot of resources &
money)
2)
S/W is developed during the implementation phase, so no
early prototype of the s/w is produced.
3)
Model doesn’t provide a clear path problem found during
testing phase.
4)
Little flexible & adjusting scope is difficult
& expensive.
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