1. Introduction 2. Understanding Behaviour 2.1 Economic assumptions 2.2 Behavioural economics 2.3 The role of information and the value action gap 2.4 Values, beliefs and attitudes 2.5 Norms and identity 2.6 Agency, efficacy and control 2.7 Habit and routine 2.8 The role of emotions 2.9 External factors 2.10 Self regulation 2.11 Societal factors 3. Using Behavioural Models 4. Understanding Change 4.1 Changing habits 4.2 Change in stages 4.3 Change via social networks 4.4 Change as learning 4.5 Change in systems 5. Applied Approaches to Change 6. Issues Around Intervening 6.1 Ethical issues 6.2 Equity issues 6.3 Side effects 7. Using Behavioural Models with Theories of Change Appendices i) Tables matching behaviours to models ii) Methodology iii) Organisations and Individuals Contacted iv) Electronic bibliography v) References