Test validity isn’t a simple “good” or “bad” assessment; it’s judged by the decisions made based on test results, not solely the test itself. While early views focused on construct, content, and criterion evidence, modern approaches require a comprehensive, unitary argument. This involves gathering evidence throughout the test’s development, considering all stakeholders (test-takers, teachers, policymakers, etc.), and presenting a logical case supporting decisions based on the test’s performance. A single number doesn’t define validity; it’s a multifaceted argument built from various evidence sources.
