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The extent to which a set of operations, test, or other assessment measures what it is supposed to measure. Validity is not a property of a data set but refers to the appropriateness of inferences from test scores or other forms of assessment and the credibility of the interpretations that are made concerning the findings of a measurement effort.
For CAEP purposes, assessments that provide evidence of P-12 students’ intended educational outcomes as measured by standardized tests and other assessments. For CAEP purposes, VAM should demonstrate the change over time of intended educational outcomes that is attributable to teacher preparation programs.
The degree to which a measure or result is able to be independently confirmed or substantiated. This is partly a matter of whether the process of creating the current value of the measure is replicable, and if repeating the process would yield a similar result. This principle implies reliability, but goes beyond it to require transparency and full documentation—whether sufficient information is available to enable any third party to independently corroborate what was found.