Book excerpt: This volume presents a theoretical framework and background for designing computer-assisted instruction (CAI). Its goal is to synthesize theoretical and applied research in CAI-relevant fields including theories of learning and instruction, systems for instructional design, and experience with CAI. Building on this knowledge, the book shows how computer technology interacts with instruction to influence the design of effective lessons. Designers, practitioners, and students of CAI and computer-based training (CBT) should find this text very helpful in developing a better understanding of the potential and limitations of computers as tutors.