The program structure should be partitioned both horizontally and vertically.
(1) Horizontal partitioning defines separate branches of the modular hierarchy for each major program function.
Simplest way is to partition a system into: input, data transformation (processing), and output
Advantages of horizontal partition:
- easy to test, maintain, and extend
- fewer side effects in change propagation or error propagation
Disadvantage: more data to be passed across module interfaces
- complicate the overall control of program flow
(2) Vertical partitioning suggests the control and work should be distributed top-down in program structure.
Advantages:
- good at dealing with changes:
- easy to maintain the changes
- reduce the change impact and and propagation
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