There is something called "Spiral Delta Model"
This is waterfall folded in the middle and spiralled (Iterated).
RS: Requirements Spec
FS: Functional Spec
UT(P): Unit Test (Plan)
IT(P): Integration Test (Plan)
ST(P): System Test (Plan)
AT (P): Acceptance Test (Plan)
Convert that to a Delta shape with iterations
This is a tight Delta Spiral. And after a few
cycles, we hopefully hit the bulls eye!:)
As we know, different models are appropriate for
different stuations. So what are the salient differences of Extreme Prog and when is is appropriate?
The article makes good reading but leave hugh and dry