What factors affect the test-retest reliability of the tests designed to measure

What factors affect the test-retest reliability of the tests designed to measure the developing cognitive and motor skills of infants?
Has to answer that question
Psychological Testing and Assessment: An Introduction to Tests and Measurement
Ronald Jay Cohen & Mark E. Swerdlik, 2018
McGraw-Hill Education
ISBN.13: 978-1-260-15234-0

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