Snippet from an essay on Beyond Intractibility, which is a site containing a knowledgebase centered around ideas useful for conflict resolution. Worth a browse.

There are several key ways in which people attempt to overcome, or do away with, cognitive dissonance. One is by ignoring or eliminating the dissonant cognitions. By pretending that ice cream is not bad for me, I can have my cake and eat it too, so to speak. Ignoring the dissonant cognition allows us to do things we might otherwise view as wrong or inappropriate.
Another way to overcome cognitive dissonance is to alter the importance (or lack thereof) of certain cognitions. By either deciding that ice cream is extremely good (I can’t do without it) or that losing weight isn’t that important (I look good anyway), the problem of dissonance can be lessened. If one of the dissonant cognitions outweighs the other in importance, the mind has less difficulty dealing with the dissonance — and the result means that I can eat my ice cream and not feel bad about it.
Yet another way that people react to cognitive dissonance is by adding or creating new cognitions. By creating or emphasizing new cognitions, I can overwhelm the fact that I know ice cream is bad for my weight loss. For instance, I can emphasize new cognitions such as “I exercise three times a week” or “I need calcium and dairy products” or “I had a small dinner,” etc. These new cognitions allow for the lessening of dissonance, as I now have multiple cognitions that say ice cream is okay, and only one, which says I shouldn’t eat it.
Finally, perhaps the most important way people deal with cognitive dissonance is to prevent it in the first place. If someone is presented with information that is dissonant from what they already know, the easiest way to deal with this new information is to ignore it, refuse to accept it, or simply avoid that type of information in general. Thus, a new study that says ice cream is more fattening than originally thought would be easily dealt with by ignoring it. Further, future problems can be prevented by simply avoiding that type of information — simply refusing to read studies on ice cream, health magazines, etc.
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