Describe cognitive dissonance theory. How can dissonance be created and reduced? Think of examples from your own life when you have probably used dissonance reduction techniques. How does dissonance reduction contribute to a person's sense of self?
http://psychclassics.yorku.ca/Festinger/index.htm Cognitive Consequences of Forced Compliance by Leon Festinger and James Carlsmith provides a classic demonstration of dissonance creation and reduction. This article is a true classic and a must-read for any student of social psychology.