Defining the evolving concept of impairment / Sam Goldstein and Jack A. Naglieri -- Measurement of symptom severity and impairment / Lawrence J. Lewandowski, Benjamin J. Lovett, and Michael Gordon -- The role of family and situational problems in understanding and reducing impairment / John W. Eagle -- Relationships between adaptive behavior and impairment / Jeffrey Ditterline and Thomas Oakland -- Psychometric issues in the assessment of impairment / Jack A. Naglieri -- The medical model of impairment / Norma Leclair, Steven Leclair, and Christopher R. Brigham -- The DSM model of impairment / Diana K. Joyce and Allison G. Dempsey -- Measuring impairment in a legal context : practical considerations in the evaluation of psychiatric and learning disabilities / Benjamin J. Lovett, Michael Gordon, and Lawrence J. Lewandowski -- Impairment in children / Gregory A. Fabiano and William E. Pelham Jr. -- Impairment in the geriatric population / Holly Tuokko and Lesley Ritchie -- Assessing occupational disability following trauma and impairment / Jasen M. Walker and Stacey A. Petersen -- Conclusion / Sam Goldstein and Jack A. Naglieri.