The gradual process of developing functions to solve each subproblem in a top-down design is known as stepwise refinement.
The term refers to backlog preparation and is more properly known as refinement. It is the act of detailing, understanding more deeply, adding features, estimating, prioritizing and keeping the product backlog alive.
Stepwise refinement is the idea that software is developed by moving through the levels of abstraction, beginning at higher levels and, incrementally refining the software through each level of abstraction, providing more detail at each increment.
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