2. Disease causation and the diagnostic process in relation to public health; prevention and health promotion. 2a Epidemiological Paradigms Hannah Pheasant, revised in 2017 by Mary Hall 2b Epidemiology of Diseases of Public Health Significance Maria Kirwan 2c Diagnosis and Screening Murad Ruf, Oliver Morgan, revised in 2017 by Kelly Mackenzie 2d Genetics Public Health Genetics Unit, revised in 2017 by Helen Green 2e Health and Social Behaviour Hannah Pheasant, Sally Cartwright, Rebecca Nunn 2f Environment Paul Wilkinson, revised in 2017 by Helen Crabbe and Rebecca Close 2g Health Protection and Communicable Disease Sarah Anderson, Gayatri Manikkavasagan, revised in 2017 by Kiran Gill, David Roberts, Gayatri Amirthalingam and Claire Cameron 2h Principles and Practice of Health Promotion Viv Speller 2i Disease Prevention, Models of Behaviour Change Viv Speller