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associated with increased effectiveness in internet-based behaviour change interventions [3]. Some behaviour change theories have even been developed specifically for use in technology-based interventions [27] However, because many people working in health informatics focus on technology not psychology, the use of behaviour change theory in online or mobile interventions originates mainly from another discipline: psychologists and public health workers familiar with behaviour change theory, who are moving toward using computers and mobile devices as affordable, scalable channels to reach their patients. Many interventions developed by people working in health informatics also aim to help patients stop smoking, provide a tailored decision aid, or influence other health behaviours or health professionals, but do not report using a health behaviour or behaviour change theory. The goal of many systems designed to support clinicians could also be characterized as “behaviour change” - for example, aiming to increase screening for a particular problem, reduce ordering of unnecessary tests, or changing from the use of one medication to another [28]. One of the reasons given for failure to incorporate new evidence into practice is “habit,” implying that behaviour change theory has potential application in this area as well. There is a clear opportunity for greater collaboration and multidisciplinary cooperation between the fields of health psychology, health promotion and health informatics, and an urgent need to apply health behaviour and behaviour change theories in designing and evaluating health IT interventions. One way to promote this is to include insights from psychology and behaviour change theories in health informatics education programmes. Teaching questions for reflection 1. What do people working in health informatics need to know about behaviour change theory and techniques? 2. Does basing the design of an intervention on Behaviour Change Theory always lead to a more effective intervention? If not, why not? 3. How else can people working in health informatics make use of behaviour change theory to improve the impact of our work? 4. How can we help the field move forward and understand which Behaviour Change Theories work best in specific contexts? References [1] R. Davis, R. Campbell , Z. Hildon, L. Hobbs, S. Michie. Theories of behaviour and behaviour change across the social and behavioural sciences: a scoping review. Health Psychology Review. 9 (2015), 323- 344. [2] A. Bandura. Social cognitive theory: An agentic perspective. Annu Rev Psychol.. 52 (2001), 1-26. [3] T.L. Webb, J. Joseph, L. Yardley, S. Michie. Using the internet to promote health behaviour change: a systematic review and meta-analysis of the impact of theoretical basis, use of behaviour change techniques, and mode of delivery on efficacy. J Med Internet Res.17 (2010) e4. [4] I.M. Rosenstock. Why people use health services. Milbank Mem Fund Q. 44 (1966) S94-127 [5] I.M. Rosenstock, V.J. Strecher, M.H. Becker. Social learning theory and the health belief model. Health Educ. Q. 15(1988), 175–83 [6] C.J. Carpenter. A meta-analysis of the effectiveness of health belief model variables in predicting behaviour. Health Commun. 25 (2010):661-9. [7] P. Sheeran, T.L. Webb. The Intention–Behavior Gap. Social and Personality Psychology Compass. 9 (2016), 503-518. S.MedlockandJ.C.Wyatt /HealthBehaviourTheory inHealth Informatics 157