Many of the techniques of quantitative cognitive science hold promise for aiding individuals who have problems in living. Increasingly, these studiesare appearing in mainstream clinical-science and clinical-practice journals. The contributors to this volume showcase fertile clinical applications of quantitative cognitive science in charting abnormalities among groups and individuals: they also show how readers can apply these techniques in their own research, assessments and practice. The contributors are cognitive scientist who have formally modeled clinically relevant aspects of cognitive functioning among special populations as wellas clinical scientists who have adapted techniques of quantitative cognitive science to advance their clinical research and assessment.