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Explain the term step-wise refinement. 

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Step Wise Refinement

Refinement is a process of elaboration. Here one begins with a statement of function that is defined at a high-level abstraction. That is the statement describes the program/function conceptually but provides no information about internal working. Refinement causes the programmer to elaborate on the original statement providing more and more detail. In a stepwise refinement, at each step of refinement one or several instructions of the given program are decomposed into more detailed instructions. The successive refinement terminates when all the instructions are expressed in terms of atomic expressions of the language. 

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