This guide describes functional behaviour assessment (FBA), a highly regarded strategy that parents and professionals can use to identify the factors contributing to the problem behaviour. As the book explains, children and adults with autism spectrum disorders (ASDs) are susceptible to unwanted behaviours due to difficulties with communication skills, social skills, and narrow interests. An FBA helps to determine what purpose the behaviour serves for the individual and the specific circumstances that led to learning the behaviour in the first place. Later on, the assessment is used to develop an intervention plan to help the individual unlearn the behaviour. With Functional Behavior Assessment for People with Autism caregivers are well on the way to breaking down the barriers created by challenging behaviour.