I only recently came across the field of research known as captology, where the psychological principles of persuasion is combined with computer technology. Assuming that user experience design already involves a significant amount of study in psychology and user behaviour, how much more does this field really add to UX in general, and has the been any specific projects that you have worked on where you have taken these concepts into consideration?
There's Human Factors International methodology of persuasive design called PET design™, which stands for Persuasion, Emotion and Trust, rooted in social psychology, and based on Fogg, Caldini, Weinschenk and other researchers. As HFI certified user experience analyst I've used this methodology in practice. Please, check some links on this topic: