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What is the definiton of top down design?

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What is the definiton of top down design?

Top down design progresses from simple design to detailed design. Top down design solves problems by breaking them down into smaller, easier to solve subproblems. Top down design creates solutions to these smaller problems, and then tests them using test drivers. In other words, top down design starts the design process with the main module or system, then progresses down to lower level modules and subsystems. To put it differently, top down design looks at the whole system, and then explodes it into subsystems, or smaller parts. A systems engineer or systems analyst determines what the top level objectives are, and how they can be met. He then divides the system into subsystems, i.e. breaks the whole system into logical, manageable-size modules, and deals with them individually.

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