MTAP, the Multidimensional Task Ability Profile offers a powerful approach to integrated functional capacity evaluation. Psychophysical research has demonstrated that people won't undertake what they believe they cannot do. MTAP uncovers this tendency. Developed by a team led by orthopaedic spinal surgeon Dr. Vert Mooney and psychologist Dr. Leonard Matheson, MTAP is the most recent method to identify unstated work function themes. These work function themes guide participation in work behavior. As a key psychophysical variable, work function themes must be identified by rehabilitation professionals and addressed clinically.