In developing a rehabilitation plan for clients with severe mental illnesses, several questions arise including which skill areas to target for rehabilitation and when to utilize specific rehabilitation strategies. The Rehabilitation Readiness Determination Profile (RRDP) is a new expressed needs interview designed to answer these questions. This study reports reliability and validity data on the RRDP. Twenty-five individuals with schizophrenia or schizoaffective disorder were administered the RRDP interview, and also received ratings of symptoms and attendance at rehabilitation groups. Interrater reliability was documented for RRDP ratings. Readiness ratings were partially influenced by symptoms (mainly negative symptoms), but did predict rehabilitation group attendance independent of symptoms. The data support the reliability and validity of a new interview for assessing rehabilitation needs.