This report describes the implementation and evaluation activities of the University of Illinois Computer-Based Education Research Laboratory's demonstration of computer-delivered elementary reading and mathematics instruction in classroom settings using the PLATO system. Seven chapters include introductory material providing a context for the demonstration and an introduction to the PLATO system; descriptions of the Computer-based Education Research Laboratory, the curriculum project, and the evaluative data sources for reading and mathematics; implementation of the demonstrations; classroom activities presented from the role perspective of teachers, students, and classroom observers; the implementation of PLATO, depicted from both chronological and cross-sectional perspectives; achievement and attitude scale results; and the various test item results. Appendices contain five papers on pilot year analysis of the project; the demonstration year statistics; and all of the data collection instruments used during the project. (RAO)