Standardization: In psychometrics, standardization refers to the process of developing uniform procedures for administering and scoring tests. It ensures that each test-taker is given equal opportunities and that scores can be compared accurately.
Reliability: Reliability is a psychometric property that indicates the consistency or stability of test scores over time or across different items. A reliable test yields consistent results when administered multiple times or by different individuals.
Validity: Validity refers to how well a test measures what it intends to measure. It assesses whether a test captures the specific construct it claims to measure and whether it produces meaningful results.