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Difference between Top down and bottom up approaches for a
given project ?
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Answer Posted / koteraj
Top down design proceeds from the abstract entity to get to
the concrete design. Bottom up design proceeds from the
concrete design to get to the abstract entity.
Top down design is most often used in designing brand new
systems, while bottom up design is sometimes used when one
is reverse engineering a design; i.e. when one is trying to
figure out what somebody else designed in an existing system.
Bottom up design begins the design with the lowest level
modules or subsystems, and progresses upward to the main
program, module, or subsystem. With bottom up design, a
structure chart is necessary to determine the order of
execution, and the development of drivers is necessary to
complete the bottom up approach.
Top down design, on the other hand, begins the design with
the main or top-level module, and progresses downward to the
lowest level modules or subsystems.
Real life sometimes is a combination of top down design and
bottom up design. For instance, data modeling sessions tend
to be iterative, bouncing back and forth between top down
and bottom up modes, as the need arises.
| Is This Answer Correct ? | 105 Yes | 35 No |
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