information. The concept of consistency states that someone who commits to something, orally or in writing, is more likely to honor that commitment. This is especially true for written commitments, as they appear psychologically more concrete and can create hard proof. Someone who commits to a stance tends to behave according to that commitment. Commitment is an effective persuasive technique, because once you get someone to commit, they are more likely to engage in self-persuasion, providing themselves and others with reasons and justifications to support their commitment in order to avoid dissonance. Cialdini notes Vietnamese brainwashing of American prisoners of war to rewrite their self-image and gain automatic unenforced compliance. Another example is children being made to repeat the Pledge of Allegiance each morning and why marketers make you close popups by saying "I'll sign up later" or "No thanks, I prefer not making money". Social proof Social learning, also known as social proof, is a core principle among almost all forms of persuasion. It is based on the idea of peer influence, and is considered essential for audience-centered approaches to persuasive messages. The principle of social proof suggests what people believe or do is typically learned by observing the norms of those around us. People naturally conform their actions and beliefs to fit what society expects, as the rewards for doing so are usually greater than standing out. "The power of the crowd" is thought to be highly involved in the decisions we make. Social proof is often utilized by people in a situation that requires a decision be made. In uncertain or ambiguous situations, when multiple possibilities create choices we must make, people are likely to conform to what others do. We take cues from those around us as to what the appropriate behavior is in that moment. People often feel they will make fewer mistakes "by acting in accord with social evidence than by behaving contrary to it." Likeness This principle is simple and concise. People say "yes" to people that they like. Two major factors contribute to overall likeness. The first is physical attractiveness. People who are physically attractive seem more persuasive. They get what they want and they can easily change others' attitudes. This attractiveness is proven to send favorable messages/impressions of other traits that a person may have, such as talent, kindness, and intelligence. The second factor is similarity. People are more easily persuaded