ITPEC FE Morning October 2020 Question 47

Module Coupling — weakest type using only parameters

Data coupling is the weakest (best) degree of coupling — modules communicate only by passing simple data through parameters.

Coupling types from weakest to strongest:
- Data — only simple data passed as parameters
- Stamp — entire data structures passed (but not all fields used)
- Control — a control flag/parameter dictates another module's logic
- Common — modules share global data areas
- Content — one module directly accesses/modifies another's internals

Why not others:
- (a) Common coupling — shares global data; strong coupling
- (b) Control coupling — passes control flags that affect execution flow
- (d) Content coupling — strongest; one module accesses another's internal data or code

Key rule: Data coupling = only parameters, no control flags, no shared globals, no internal access.

AI-generated — may contain errors