An overview and rationale for the Science Curriculum for Individualized Learning (SCIL) are provided. SCIL is the result of the individualization of the SCIS program. The SCIL management system is based on the exploration, invention, and discovery concepts of Piagetian theory. An evaluation study of two SCIl units, Interactions and Systems and Subsystems and Variables is presented. It was found that over 90 percent of the SCIL students in grades 3-6 achieved cognitive goals as measured by completed discovery lessons. Students in the SCIL program chose more positive responses when compared to students in teacher-made traditional curriculum. The SCIL students also chose more positive responses when compared with nonindividualized programs. Third grade SCIl study chose more positive response than did SCIL students in grades, 4, 5, and 6 suggesting that the units were well suited for the third grade students' developmental level. The parents of SCIL students chose highly positive responses when asked their perceptions of their children in relation to SCIL and science activities. (Author)