The principle of persuasion based on the idea that people typically stay with something once they have committed to it is known as consistency
The consistency principle, also known as the consistency principle in negotiation, describes a negotiator's strong psychological urge to remain consistent with previous actions and comments. According to the consistency principle, people want to be cognitively consistent and will alter their attitudes, beliefs, perceptions, and behavior to get there.
The "Consistency Principle of Persuasion," as it is known by Robert Cialdini and his research team, has been the subject of substantial study. This concept asserts that people adhere to what they have publicly declared they would do and what they have written down, as described in his book Influence Science and Practice. To ensure that others keep their promises, Cialdini advises people to have others put them in writing.
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