Autism spectrum disorder. The ability to understand and explain that:

1. Traits of autism spectrum disorder (ASD) are often seen in outpatients with OCD, and that a comorbid diagnosis of ASD may be appropriate in up to a quarter of individuals with OCD   Evidence: OR: Accordino et al 2017 • CSS: Bejerot et al. (2001), Micali et al. (2004), Wikramanayake et al (2017)

2. The ability to understand and explain that OCD patients with high levels of ASD symptoms typically have reduced cognitive flexibility, reduced insight, and impaired social skills and social communication, relative to those with OCD without ASD   Evidence: OR: Accordino et al 2017 • CSS: Wikramanayake et al 2017