Validity & Reliability

• Face validity is the extent to which something looks as if it will measure what it is supposed to measure (e.g. Relevant questions on a questionnaire.)
• Construct validity is the extent to which a test measures all aspects of behaviour.
• Concurrent validity is the extent to which a test correlates well with a measure of the same thing that has previously been researched.
• Predicative validity refers to the extent that a measure can predict future behaviour.
• The split half method is used to measure internal reliability (particularly in self reports) where repeat questions are asked to check how consistent the participants responses are.
• The test-retest method is used to measure the external reliability of research. It is where participants are tested more than once to check they are getting consistent results.