Computer Supported Intentional Learning Environments (CSILE) is a project using computer software to promote the constructive processes involved in intentional learning. CSILE enables groups of students to build a collective database (knowledge base) of their thoughts, in the form of pictures (created by students using a color graphics editor) and written notes. CSILE was initially developed for university and graduate-level students; current research focuses on 64 students in two sixth-grade classes. The report offers 11 principles applicable to a variety of educational software and then discusses the application of that principle to the project: (1) make knowledge-construction activities overt; (2) maintain attention to cognitive goals; (3) treat knowledge lacks in a positive way; (4) provide process-relevant feedback; (5) encourage learning strategies other than rehearsal; (6) encourage multiple passes through information; (7) support varied ways for students to organize their knowledge; (8) encourage maximum use and examination of existing knowledge; (9) provide opportunities for reflectivity and individual learning styles; (10) facilitate transfer of knowledge across contexts; and (11) give students more responsibility for contributing to each other's learning. CSILE examples cover both how principles were being realized, and how novices can at times circumvent the goal of eliciting extra constructive effort. (LPG)