This administrator's summary describes the Tests of Achievement and Proficiency (TAP). The TAP battery is designed to provide information about the strengths and weaknesses of the instructional program and about skills performance of individual students in grades 9 through 12. The TAP may be administered at the year's beginning, middle, or end; norms are provided for October, January, and April, respectively. The Iowa Tests of Basic Skills and the TAP together provide 14 test levels to survey elementary and secondary education in order to ensure accurate grade-to-grade measurement. Tests are numbered to correspond roughly to age rather than grade. The TAP battery consists of the following tests: (1) reading comprehension; (2) mathematics; (3) written expression; (4) using sources of information; (5) social studies; and (6) science. TAP also provides an Applied Proficiency Skills score based on selected items from the first four tests to reflect student application of basic skills. Optional tests in listening and writing are available for all TAP forms. A specific description of each test is given, and the measurement of higher order thinking skills by the TAP tests is described. Information is provided about test reliability, validity, bias, and norming procedures. The optional support materials available are described. Six tables present details about the test battery, and four figures illustrate the discussion. (SLD)