High Quality Content by WIKIPEDIA articles! Behavioural change theories and models are attempts to explain the reasons behind alterations in individuals` behavioural patterns. These theories cite environmental, personal, and behavioural characteristics as the major factors in behavioural determination. In recent years, there has been increased interest in the application of these theories in the areas of health, education, criminology, energy and international development with the hope that understanding behavioural change will improve the services offered in these areas.