A psychological intervention is an action that is done to make something change. This might be therapy sessions and homework assignments as described in the section above. Another type of psychological intervention is when your psychologist creates a plan that tells you and your key support people things to do that will help to change your behaviour. These are called behaviour modification programmes, behaviour management programmes, behavioural programmes, etc. Our interventions use the empirically derived techniques of Applied Behaviour Analysis (ABA) to change behaviour. Before your psychologist writes a plan like this, she will talk to you about it, explain why it is necessary and how much it is likely to cost.