Under Title V, Guidance, Counseling, and Testing of the "National Defense Education Act of 1958," the Congress of the United States has recognized the value of tests as a tool which may be used to help make an early determination of the aptitudes and abilities of the students in U.S. schools. This bulletin attempts to explain the use and limitation of regularly administered tests, so as to enable administrators, counselors, and teachers to interpret better their meaning to parents and students. Document contents include: (1) Introduction; (2) Development of a Standardized Test; (3) Intelligence, Mental Ability, or Scholastic Aptitude Tests; (4) Achievement Tests; (5) Scoring a Multiple-Choice Test; (6) Accuracy of Test Results; (7) Analysis of Class Achievement; (8) Classroom Interpretation of Test Scores; (9) Interpretation of Test Results to Parents; and (10) Selected References. (Contains 17 footnotes and 8 figures.) [Best copy available has been provided.]