Standardized testing is one of the tools used by clinicians in a diagnostic evaluation, administered for the purpose of assessing a communicative skill or behavior, with the results situating an individual in the context of a population. This typically involves norm-referenced test administration as an adjunct to other types of data collection, conducted in the process of generating a diagnosis, recommendations, and a prognosis. Standardized testing, also referred to as formal assessment, is a traditional means of collecting initial clinical baseline data on which diagnoses are formulated and eligibility for services is determined.

Two fundamental principles in standardized testing are validity, which deals with how well a test measures what it is designed to measure, and reliability, which relates to the consistency of scores on the ...

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