Dictionary of British Education
A technical term which must be distinguished from validity.
Reliability means the extent to which a test or an individual test item will give the same result on different occasions. For example, an individual test of intelligence should give the same result for a given individual on a number of separate occasions. If it does this, it could be said to be a ‘reliable test’ even if there were some doubts as to whether or not it was measuring real intelligence—i.e., a question of the validity of the test.
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