A why why chart allows you to unpick a child's behaviour. It allows you to look at the communicative function of the behaviour.You start with writing in the top box a question, this would relate to the behaviour you are seeing. For example 'why does Sarah hit the child in front of her in the line'. You then move down the boxes and write possible reasons, such as sensory need. You fill in as many boxes as possible until you finally get to what you think the underlying message of the behaviour cou