This report takes a broad, analytical look at three systems that emphasize individualized instruction: Program for Learning in Accordance with Needs (PLAN), Individually Guided Education (IGE), and Individually Prescribed Instruction (IPI). In this assessment the following areas are examined: (a) the principles that characterize the system, (b) the materials and how they are organized, (c) the implementation of the systems in schools, and (d) the evaluation and research data on each system. This report discusses findings from interviews with developers and their representatives; visits to schools using the systems; site visits and interviews conducted with students, teachers, administrators and parents; and observations of the instruction system in action. (PD)