Validity evidence in assessments is the foundation for determining whether an assessment supports the interpretations and decisions made from its scores. In educational measurement, it helps establish whether an assessment accurately reflects the knowledge, skills, or abilities it is intended to measure.
Rather than being a fixed quality of a test, validity depends on evidence gathered for a specific purpose and context. Understanding validity evidence in assessments is therefore essential for designing fair, meaningful, and defensible educational evaluations.
Validity evidence in assessments refers to empirical information used to evaluate whether interpretations and decisions based on test scores are justified for a particular purpose. Validity is not an inherent property of a test; it concerns how scores are interpreted and used in context.
Educational measurement commonly considers evidence based on test content, response processes, internal structure, and relationships with other variables. Evidence about consequences may also inform evaluation, particularly when score use produces intended or unintended effects.
Content evidence examines whether tasks represent the knowledge and skills being assessed. Response-process evidence considers whether learners and scorers engage with tasks as intended. Internal-structure evidence evaluates relationships among items, domains, or dimensions.
No single source proves validity. A sound validity argument integrates relevant evidence, identifies limitations, and remains open to revision when the assessment population, administration conditions, or intended use changes.