One of the most valuable uses of microcomputers and word processors in composition instruction is in the teaching of writing revision. A number of activities can be carried out with these tools; for example, (1) after appropriate instruction on revision, students can be given prewritten text and asked to revise it on the word processors; (2) after a student has composed a text, the microcomputer can suggest that revisions be made; and (3) after a student has composed a text, the microcomputer can look for specific kinds of errors in the writing, mark the place where the errors occur, and require the student to correct them. Microcomputers and word processors may also be used to teach students sentence combining and how to generate and arrange content. (LLS)