Abstract
Direct service professionals (DSPs) provide treatment to individuals with developmental disabilities; however, high levels of performance are not always prevalent among these professionals. The present study examined the effect of an intervention package with verbal and written performance feedback and a performance-based lottery alone as part of a treatment package including an acceptance and commitment therapy (ACT)-based training program on the frequency and technical competence of active treatment for individuals with disabilities provided by DSPs. Both intervention groups performed significantly better than the control group on all observational measures (p < .05). The performance enhancement intervention (PEI) plus ACT group outperformed the PEI group significantly in frequency of active treatment at posttest (p < .05). Self-reported levels of psychological flexibility, workplace stress, and job satisfaction remained stable for all three groups from pre- to posttest despite the increased performance among DSPs in the two intervention groups.