The concept of peer-mediated instruction (PMI) grew out of the author's earlier research on applying techniques of drill and practice computer-assisted instruction (CAI) to language skills learning. Peer-mediated instruction directs pupils to work in pairs, interacting with one another according to structured pattern of dialogue. This book provides detailed accounts of the use of this concept in teaching language skills, primarily spelling (elementary school) and reading (secondary school). The chapters include: "CAI Origins,""The First PMI System,""From Special to General Purpose,""The Experiment,""An In-Service Application: The Jackson PMI Project," and "Observations and Reflections." A peer-mediated instruction management system handbook is included. (WR)