Behavioural economics attempts to embody the concept of addiction within an array of theories and evidence that acknowledge both the operant nature of addiction behaviours and the apparent irrationality of compulsive choice despite negative consequences. Framing addiction within the sphere of 'choice' prompts behavioural economic theorists to predict that variables can be manipulated to influence choice from one direction to another, despite addiction. Recently, evidence has been provided which suggests that this 'choice' for addicts is somewhat impaired by problems in decision making, particular to substance dependent individuals. Through the development of novel decision making tools and between-groups analysis the focus of this research has been in exploring this decision-making deficit.