Many factors can be identified that may lead to the development of a psychological disorder (addiction included) such as genetics (bio), difficulty regulating emotions (psycho) or environmental stress (social). The biopsychosocial model has been adapted to examine biological, psychological and social factors affecting an individual, to examine how and why disorders occur and determine treatment accordingly. After all, behavioural problems could be caused by social or familial unrest as well as medical issues like poor hearing, eyesight, attention-deficit hyperactivity disorder (ADHD), etc. A biopsychosocial interview is conducted at the commencement of therapy and assesses for biological, psychological and social factors that can be contributing to a problem or problems with a client. It's considered a holistic assessment, looking at a client from various perspectives.