Scenario 5 A rail services provider is upgrading its signalling systems, to allow train drivers and signallers to communicate securely and timely. This is seen as a safety critical system. The IT…

Question

Options

• AWalkthroughs of specifications would enable the individuals to learn more about the system being
• BWalkthroughs of signalling rules will be more cost effective than inspections.
• CInspections of code should be carried out by the developers, whilst code walkthroughs should
• DA walkthrough is an example of a static testing technique, whilst an inspection is an example of a

• A
  72% (33)
• B
  17% (8)
• C
  9% (4)
• D
  2% (1)

Explanation

Option A is correct because walkthroughs are specifically designed for knowledge sharing and learning - the author walks participants through the work product. Given that the rail provider has lost most of its development and test staff, walkthroughs of specifications would be invaluable for onboarding new recruits, helping them understand the safety-critical signalling system quickly and efficiently.

Option B is wrong because cost-effectiveness is not the defining difference between walkthroughs and inspections; inspections, though more expensive, often find more defects per hour due to their structured rigor, making the comparison context-dependent rather than absolute.

Option C is wrong because it inverts reality: in a walkthrough, it is the author (developer) who leads the session, while inspections are led by a trained moderator, not the author - so developers should not be the sole conductors of inspections.

Option D is wrong because both walkthroughs and inspections are static testing techniques (they review work products without executing code); the distinction between them is not static vs. dynamic but rather informal/educational vs. formal/defect-focused.

Memory tip: Think of a WALKthrough as a guided tour where the author walks newcomers through the material to build understanding. An INSPECTION is like a formal audit - structured roles, checklists, and a trained moderator hunting for defects. When staff turnover is high, you walk new people in before you inspect.

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