Occupational therapists (OTs) have an established role in assessing readiness for return to work. Functional capacity evaluation (FCE) is one method frequently used for this purpose. This chapter describes the new Gibson approach to functional capacity evaluation (GAPP FCE). The assessment was developed by OTs. It provides an evidence-based and integrated framework for OTs to assess comprehensively the many aspects of performance of the physical demands of work. These aspects include key psychosocial variables known to influence physical performance and return to work. The GAPP FCE is described, including the eight-step process and a summary of evidence to date. Being able to perform the physical demands of work entails more than being physically able to perform the tasks, and assessing this performance entails more than seeing what aclient can do physically.