ABSTRACT This article examines in detail three Latin courses which have been in operation for several years on the PLATO IV computer-assisted instruction system: “Beginning Latin,” “Latin Composition,” and “Vergil's Aeneid.” These programs are supplemental to classroom work and have proved very effective in individualizing instruction. The lessons primarily provide drill and practice along with diagnostic information on current progress. Class time thus released can be given to more complex activities. Complete records can be kept and easily accessed so that instructors can evaluate individual and group strengths and weaknesses. Use of CAT lessons does not necessitate a knowledge of computer programming; one can use materials already developed in the same manner as one uses a textbook. In all, the computer appears to be a most useful tool for the FL instructor, and mass production would appear to make it economically viable as well.