The success of cognitive behavior therapy in general, as well as CBTp, stems in great part from demonstrating changes in symptoms over time, with measures showing improvements between pretherapy and both post-therapy and follow-up. This chapter proposes measures that can be used quickly and efficiently in a clinical setting to demonstrate the impact of the group CBTp. Measures specific to CBT for psychosis such as the CHOICE, as well as measures of concepts that have shown improvements following CBTp, such as symptoms, self-esteem, coping skills, social support, self-stigma, and social functioning, are described. Other measures of interest to assessing processes in therapy, such as alliance with therapists, group cohesion, participation within the group, and measures of treatment fidelity or therapist competence are also suggested.