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Module 3: Software Design & Metrics

20262m

Halstead's software science primarily uses counts of

(i) Modules and classes
(ii) Operators and operands
(iii) Test cases and defects
(iv) Inputs and outputs only

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Solution

Correct Answer: (ii) Operators and operands

Explanation

Halstead's software science measures a program using counts of its operators and operands:

  • n1 = distinct operators, n2 = distinct operands
  • N1 = total operators, N2 = total operands

From these:

  • Vocabulary n = n1 + n2
  • Length N = N1 + N2
  • Volume V = N × log2(n)

Why other options are incorrect:

  • (i) Modules and classes - used in design metrics, not Halstead.
  • (iii) Test cases and defects - testing/quality metrics.
  • (iv) Inputs and outputs only - that is closer to Function Point Analysis.

Answer: (ii) Operators and operands

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