This course aims to introduce students to the main concepts and tools of the growing fields of behavioural science. The course covers the following topics: What is behavioural science?; What are preferences to economists and psychologists?; Dual-process models of behaviour and the role of the unconscious mind; Dual processing into policy using the MINDSPACE checklist; the role of emotions in decision making; compensating behaviours; breaking and creating habits. Students will develop an understanding of how people make decisions across a variety of contexts and the importance of understanding decisions for designing policy in both public and private organisations. We will cover canonical texts and ideas from behavioural science such as Kahneman & Tversky and Thaler & Sunstein, and we will also introduce students to cutting-edge research within behavioural science including recent work by our own faculty.