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1. Test-retest
In the test-retest method of determining reliability, the same instrument is administered twice to the same population, and if the results are the same, stability of measurement is assumed.
An example would be giving the same survey questions to a group of people, then latter giving the same group of people the same survey with the same question. Now if both surveys have the same results then there is reliability in the survey.
2. Multiple forms
Multiple forms involve the administration of alternate forms of the instrument to the same group.
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