The Program for Learning in Accordance with Needs (PLAN) was devised to be self-improving through a system of computer analysis of student performance data. The PLAN instructional program consists of teaching-learning units in various subject areas, such as reading and science, which are composed of self-paced alternative learning activities, objectives, and criterion tests. Two types of student performance data related to specific objectives (derived from statistics for the number of students selecting each option on tests, frequency distributions of student scores on an objective by objective basis, and on a unit by unit basis, and cross validation data on parallel items) and subjective teacher and student judgements. Examination and analysis of these data by computer reveal whether a unit needs refinement or not; if it does, the data can reveal the difficulty, whether it is a lack of consistency in activities and objectives between learning, a poorly stated problem, inappropriate sequencing of learning activities, or lack of student understanding of the presentation format. (SP)