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External Reliabilty
This type of reliability refers to the extent to which a measure varies from one use to another. The external Reliability of self-report measures, such as psychometric tests and Questionnaires can be assessed using the test-retest method. This involves testing the same Participant twice over a period of time on the same test. Similar scores would suggest that the test has external reliability.
A common way of assessing the external Reliability of observations is to use inter-rater reliability. This involves comparing the ratings of two or more observers and checking for agreement in their measurements. Inter-rater reliability can also be used for interviews.
