Top-down and bottom-up design

Describe the Top-down and bottom-up design? Illustrate in brief.

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Top-down and bottom-up are the policies of information processing and knowledge ordering, generally comprising software, however as well other humanistic and scientific theories. In practice, they can be view as a style of thinking and teaching. In most of the cases top-down is employed as a synonym of the analysis or decomposition and bottom-up of synthesis.

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