This handbook is intended to help high school and college counselors effectively use and interpret ACT results. It contains four main sections: Section 1, "Components of the ACT," which contains general information about the ACT tests, probably will be of interest both to high school counselors and to college advisors and other staff. In Section 2, "ACT Reports and Data Services" and Section 3, "Using ACT Student Data," the first half of the material in each section is intended primarily for high schools; the latter half is primarily directed toward colleges. Section 4, "Taking the ACT," is mostly for high schools, although colleges may be interested in the information about various testing programs. (Contains 12 figures, 3 tables, and an index.)