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 that they are more objective and cover broader content. Standardized tests allow student performance to be compared across districts and states. While they provide reliable comparisons, they also place stress on students and teachers and may not fully evaluate student growth throughout the year. Standardized achievement tests can be used by schools to evaluate curriculum, identify students needing extra help or advanced classes, and determine teacher effectiveness. They follow procedures including deciding the test purpose, specifying objectives, creating test items, administering the test, and analyzing results.