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Applied Research

Validity and reliability in research design

  • 3 things to know
  • A2 1

Overview

Term validity, term reliability and difference between validity and reliability.

What you need to know

Answer each one before you reveal it.

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Key term

Define the term validity.

Key term

Define the term reliability.

Key term

Explain the difference between validity and reliability.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Define the term validity.

    Model answer

    Validity is the extent to which a research tool measures the thing it claims to measure.

  2. 2

    Define the term reliability.

    Model answer

    Reliability is the extent to which a research tool gives consistent results when it is used again under the same conditions.

  3. 3

    Explain the difference between validity and reliability.

    Model answer

    A reliable tool gives the same answer every time and a valid tool gives the right answer, so a tool can be perfectly consistent and still measure the wrong thing.

  4. 4

    What is face validity?

    Model answer

    Face validity is whether a tool looks, on inspection, as though it measures what it is supposed to measure.

  5. 5

    How is face validity checked?

    Model answer

    Face validity is checked by asking colleagues, a supervisor or a few likely respondents whether the questions appear to fit the objectives.

  6. 6

    What is content validity?

    Model answer

    Content validity is whether a tool covers every part of the topic the objectives set out, with no important area left out.

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