Why So Many Tests?
No single test can do it all. A diagnostic test to determine the emission level of an automobile engine will not tell you that the tires need air. A different procedure is needed to provide that information. The same goes for tests in education. No single test can ascertain whether all educational goals are being met. A variety of tests, or "multiple measures," is necessary to tell educators what students know and can do. And just as different tests provide different information, no one test can tell us all we need to know about one student's progress. This "multiple-measures approach" to assessment is the keystone to valid, reliable, fair information about student achievement. Any one type of test, whether norm-referenced, multiple-choice or performance assessment, is only one part of a balanced approach to assessment.
For example, some tests are designed to indicate whether a student needs additional work in specific subjects, while others measure overall group progress toward broadly stated goals. A multiple-measures approach means that states and local school districts often use different types of tests to assess students. Educators understand the real power and utility of creating testing programs that combine performance assessments, norm-referenced tests and other measures. This approach puts the right kind of assessment to work for the right purpose. Performance assessments, for example, might be used for instructional purposes, while norm-referenced tests are used to generate comparative information. Such data continue to be in great demand as the educational community seeks to build greater accountability measures into their educational systems.