ITPEC FE Morning April 2021 Question 48

Module Coupling — identify the weakest (best) type of coupling between modules.

Coupling types from weakest to strongest:

• •Data coupling — pass only required data items as arguments
• •Stamp coupling — pass entire data structures (even if only part is needed)
• •Control coupling — pass flags/parameters that control another module's logic
• •External coupling — modules share external data format or protocol
• •Common coupling — modules share a global data area
• •Content coupling — one module directly modifies another's internals

Answer: (c) — passing only required data items = data coupling (weakest).

Why not others:
- (a) — describes low cohesion (cramming functions into one module), not coupling
- (b) — control coupling (passing logic-controlling arguments) — stronger
- (d) — common coupling (shared global area) — much stronger

Key rule: Data coupling is the weakest (most desirable) coupling — modules exchange only the specific data they need, nothing more.

AI-generated — may contain errors