Stepwise Refinement
In this approach, software systems are developed through the progressive refinement and
enhancement of high-level system specifications into source code components (Wirth 1971, Mili
1986).Incremental Development and Release
Developing systems through incremental release requires first providing essential operating
functions, then providing system users with improved and more capable versions of a system at
regular intervals (Basili 1975).Instead, formalization is expected to emerge within the heuristics and skills that
are acquired and applied through increasingly competent practice.This model has been most
effective and widely applied in helping to teach individual programmers how to organize their
software development work.Many interpretations of the classic software life cycle thus subsume
this approach within their design and implementations.This model combines the classic software life cycle with iterative
enhancement at the level of system development organization.However, the choice and order of which steps to choose and which refinements to apply
remain unstated.It also supports a strategy to