This brief introduction to testing is geared to parents. Types of tests are defined, such as standardized tests, achievement tests, norm referenced tests, criterion referenced tests, and aptitude tests. Various types of scores (grade equivalent, percentile rank, and stanine are also defined, and the uses made of tests by administrators, teachers, and counselors are described. Information provided especially for parents involves availability of testing information; helping children prepare for tests; meaning of scores; and school improvement. (MH)