Write short note on Top-down and Bottom-up design model

Subject Software Engineering
NU Year Set: 3.(d) Marks: 3+3=6 Year: 2017

Top-Down Design, is characterized by an extensive planning and research phase that leads into the development of a product.  Bottom-Up Design, takes the opposite approach.  While goals for a product are still outlined, the assembly of a product is done on a system by system basis.  While the Top-Down approach allows for structured control of a project, the Bottom-Up approach lends itself to more experimentalism. 

A bottom-up approach is the piecing together of systems to give rise to more complex systems, thus making the original systems sub-systems of the emergent system. Bottom-up processing is a type of information processing based on incoming data from the environment to form a perception.

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