This is measured with Cronbach's alpha, split-half reliability, or the Kuder-Richardson reliability estimate. Stated differently, high internal consistency means that all items are highly intercorrelated. Internal consistency is a measure of whether all components of a test evaluate a cohesive construct or set of constructs (e.g., verbal ability or visual-motor skills). Reliability focuses on how much error is involved in measurement or how much an obtained score varies from the “true score.” An observed test score = true score + measurement error. Reliability refers to consistency or accuracy in measurement. Measurement is the ability to assign numbers to individuals in systematic ways as a means of inferring properties of these individuals. JEFFRIES, in Developmental-Behavioral Pediatrics, 2008 RELIABILITY
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