Standardized achievement tests are prepared by educational specialists and administered under controlled conditions to measure what students have learned. They differ from classroom tests in being objective, standardized in format and timing, and covering entire curriculums. Standardized tests are used to compare student and school performance, identify students for special programs, and evaluate curriculum effectiveness. While they provide consistent measures, standardized tests also cause stress and may not reflect individual student growth throughout the year. Proper development of standardized achievement tests involves determining the test purpose, objectives, format, and procedures for administration, scoring, and evaluation.