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:
I used it for my master thesis together with Design with Intent (DwI) cards. In addition to this, I used it for consuming more fruit behavior. Changing behavior needs an intent and a replacement to the existing one in general.
Persuasive Design is not only about digitization of the services but instead a variable in social, contextual,product service domain. There are some sub-strategies like assisting, suggestive and to be honest, it is very open...
You can check this set of cards which will make you to understand the intent: http://www.danlockton.com/dwi/Main_Page
It may lead you to figure out another world that design can change for a purpose.
Another example is my friends master thesis, insights by Wouter Middendorf, he created also a set of card for persuasive strategies for common usage. Here is another link: http://www.middendorf.nl/insights/
Persuasive is not a new thing, it generally diffuses our choices but designing for that was something new in early 2000's.
Before believing such messages, there should be trust between two parties. Trust is for white strategies, while it is not needed when you are using black strategies of persuasion.