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Eduncle Best Answer
The split-half method assesses the internal consistency of a test, such as psychometric tests and questionnaires. There, it measures the extent to which all parts of the test contribute equally to what is being measured.
Parallel forms reliability (also called equivalent forms reliability) uses one set of questions divided into two equivalent sets (“forms”), where both sets contain questions that measure the same construct, knowledge or skill. The two sets of questions are given to the same sample of people within a short period of time and an estimate of reliability is calculated from the two sets.
The test-retest reliability method is one of the simplest ways of testing the stability and reliability of an instrument over time.