First published in 2005. This Volume 40, No 4 of Autumn 2005 of the Educational Psychologist. The articles appearing in this special issue of Educational Psychologist reflect a growing interest by researchers from various fields in examining the use of computers as metacognitive tools for enhancing learning. This topic has become increasingly important as computer-based learning environments become ubiquitous and students use them extensively both in and out of school to learn about conceptually rich domains.