Bottom Up Implementation
Using Drivers

Start with the lowest level modules and work toward the top.
Use a "test harness" or "driver" to test and debug the results at any given level.
Problem: will we be able to integrate the final pieces to satisfy the ultimate requirements? - This is why bottom-up is not considered to be a good design technique, but it is very useful and fine for implementation.
Advantage: we are always working with concrete, real data.
Generally not recommended as a design methodology, but is good for implementation.

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