Festinger and his colleagues discovered that the most effective way to change a person's attitude was:

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Festinger and his colleagues found that the most effective way to change a person's attitude was to get them to publicly express a contrary attitude for a small reward. This is known as the "foot-in-the-door" technique, where initially getting someone to make a small commitment makes them more likely to agree to a larger one later on. Putting a person in a group where many different opinions are expressed can also have an effect on their attitude, but it is not always the most effective approach. Paying someone well to publicly express a contrary attitude may seem like it would work, but research has shown that people are more likely to change their attitude if they have internalized the reasons for doing so, rather than being motivated by external rewards.

Festinger and His Colleagues Discovered That the Most Effective Way