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

• Aa and c.
• Bb and d.
• Cc and d.
• Dd and e.
• EBudget sent so far.

• A
  8% (3)
• B
  24% (9)
• C
  61% (23)
• D
  5% (2)
• E
  3% (1)

Explanation

Note: The individual items a–e are not included in your question text, so this explanation addresses the reasoning pattern rather than specific items.

Option C (c and d) is correct because, in a safety-critical system context, the best indicators of likely product quality are measures directly tied to the software's behaviour and test outcomes - such as defect density, test coverage, or review findings from the V-model checkpoints. These reflect what the product is actually doing, not how the project is being run.

Options A (a and c) and B (b and d) are wrong because they each include at least one project/process metric (e.g. staff count, schedule adherence, or budget-related items) that describes project health rather than product quality - a team can be on budget and on schedule while shipping a defective system. Option D (d and e) similarly pairs a quality metric with a project metric, diluting its predictive value for product quality. Option E (budget spent so far) is clearly wrong: expenditure tells you nothing about whether the software is correct, safe, or reliable.

Memory tip: Ask yourself - "Does this measure tell me something about the software itself, or about the project surrounding it?" Only measures that reflect the product's internal state (defects, coverage, reviews) predict product quality; schedule, budget, and headcount predict project status.

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