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Module 3: Software Design & Metrics

20227m

Define cohesion and coupling. Explain various types of each of them.

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Cohesion & Coupling (Detailed)

Cohesion - Within module:

Type Description Example
Functional Single purpose calculateSalary()
Sequential Output→Input Read→Process→Write
Communicational Same data Print/Update Student record
Procedural Sequential steps init() calls A then B
Temporal Same time startup()
Logical Similar functions inputAll()
Coincidental Random Utility misc

Order: Functional (best, 10/10) → Coincidental (worst, 1/10).

Coupling - Between modules:

Type Description
Data Parameters x,y
Stamp Structure student
Control Flag if(flag)
External Hardcoded protocol
Common Global int g;
Content goto into other module

Order: Data (best) → Content (worst).

Goal: Functional cohesion + Data coupling.

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