Standard score refers to a numeric value assigned to a test score or an assessment to reflect how well an individual has performed, relative to the norm or average score for the group. The use of synonyms helps to add variation and choice to the description of these scores. Alternative terms could include standardized scores, z-scores, deviation scores, normalized scores, and relative scores. Each of these terms describes the score in a slightly different way and has specific applications. Standardized scores are the most commonly used synonym but the others extend the value of the score for specific uses such as ranking or measuring performance improvements over time.