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Software Modules in Software Design

Software Modules in Software Design. What is a Module?. “A set of one or more contiguous program statements having a name by which other parts of the system can invoke it, and preferably having its own distinct set of variable names.” [Stevens, Myers…74].

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Software Modules in Software Design

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  1. Software Modules in Software Design

  2. What is a Module? “A set of one or more contiguous program statements having a name by which other parts of the system can invoke it, and preferably having its own distinct set of variable names.” [Stevens, Myers…74]

  3. “A module is a lexically contiguous sequence of program statements, bounded by boundary elements, having an aggregate identifier.” [Yourdon, Constantine 79]

  4. Avantages • Decomposition into easily dealt with pieces • can abstract call by descriptive naming • break up program into system “architecture” • reduce complexity that one inspector needs to view when considering a design concept • debug by following trail of destruction through interfaces to independent module for repair • what properties does a module need to accomplish all this?

  5. Conservation of Complexity • Move complexity of singular program module to interfaces between less complex modules • hierarchy and decomposition, “divide and conquer” • Net complexity is conserved, but it is divided so as to give programmers some leverage?

  6. Cohesion and Coupling(a “system” concept!) • Cohesion • the degree of interaction within a module • Coupling • the degree of interaction between modules

  7. Module Cohesion • Informational • Functional

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