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, b, d, e then c.
• Bb, e, a, d then c.
• Cb, a, d, c then e.
• De, b, a, d then c.
• EIdentify test conditions.

• A
  8% (2)
• B
  62% (16)
• C
  23% (6)
• D
  4% (1)
• E
  4% (1)

Explanation

Option B is correct because it follows the logical sequence for building test procedures using specification-based techniques: identify test conditions (b) first, then design test cases (e), then identify test data (a), then build/sequence test procedures (d), and finally execute (c). This order reflects a top-down, analysis-before-action approach - you cannot design cases without knowing conditions, and you cannot identify data without knowing what your cases require.

Why the distractors fail:

• A starts with identifying test data before conditions or cases exist - you can't know what data you need without first knowing what you're testing.
• C ends with designing test cases after execution, which reverses the entire design-before-run principle.
• D begins with designing test cases (e) before identifying conditions (b) - skipping the analysis step that cases are derived from.

Memory tip: Think of it as a narrowing funnel - "Conditions feed Cases, Cases need Data, Data drives Procedures, Procedures get Executed" (b → e → a → d → c). Each step feeds the next; reversing any adjacent pair breaks the chain.

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