This Study aims to provide an overview and critical assesments of common problems and best evidence practice in treatments for the challenging behaviors of adults with intellectual disabilities. the results of this study shows that behavioural and pharmacological interventions are most commonly used when addressing CBs in people with IDs. However, within each of these techniques, there are methods that have support in the literature for efficacy and those that do not. As clinicians, it is important to follow research so that we are engaging in best practices when developing treatment plans for CBs