Commitment and Consistency
Small commitments lead to bigger ones.
People want to act in ways consistent with what they have already said and done. Once a position has been taken, especially out loud, in writing or in front of others, the pressure to behave in line with it is considerable, and it comes as much from inside as from anyone else. This is why a small initial agreement so reliably makes a larger one easier to obtain. The first commitment does not simply put a foot in the door. It changes how a person understands themselves, and the later behaviour follows the self-image rather than the request.
Why it works
Consistency is valuable in two directions at once. Outwardly it is how we become legible to other people: someone whose positions hold from one day to the next can be relied on, and inconsistency is read as a defect of character rather than a change of mind. Inwardly it spares us the work of deciding everything twice. Once a matter is settled, consistency lets us act without reopening it. The persuasive force comes from the fact that the first commitment is usually small enough to look costless. Agreeing that road safety matters, or that you would help a charity if asked, seems to commit you to nothing. What it actually does is create a version of yourself that is now on record, and subsequent requests are judged against that record rather than on their own terms. The strongest commitments are active, public and freely chosen. A position that someone was pushed into does very little.
The finding most people miss
Sherman, Journal of Personality and Social Psychology, 1980
Steven Sherman telephoned residents in Indiana and asked a purely hypothetical question: if they were asked to spend three hours collecting for the American Cancer Society, would they agree? Three days later a different caller made the request for real. Among those who had been asked to predict their own behaviour, about a third agreed to volunteer, against roughly four percent of a comparable group approached cold. Nobody in the first call had promised anything to anyone. They had simply predicted that they would be the sort of person who helps, and then found themselves obliged to be that person. The commitment need not even be a commitment. A stated prediction is enough.
Commitment and Consistency, once you know to look.
What commitment and consistency is not.
- “Any small yes will do.”
- The commitment has to be active, and ideally chosen rather than assumed. A pre-ticked box or an agreement extracted under pressure produces very little, because nothing about the person's self-image has changed.
- “Consistency means people never change their minds.”
- They change them constantly. What they resist is being seen, by others or by themselves, to have abandoned a position without reason, which is why giving someone a dignified reason to move is often the whole job.
- “It works because people feel trapped.”
- Moriarty's bystanders were not trapped; they could have stayed on their towels with no consequence at all. They intervened because they had become someone who had agreed to watch, and that is a different and much more durable force than obligation.
Applying Commitment and Consistency honestly.
Start with something small, active and voluntary, ideally written or said aloud. Then make the larger request consistent with the position they have already taken.
The ethical line. The line sits at whether the first commitment was honest about what it was. Asking someone to state a preference, a value or an intention, and then holding them to it, is ordinary and legitimate. Engineering a trivial agreement whose real function is to make a later and much larger request difficult to refuse is a trick, and its signature is that the person would not have given the first yes had they understood what it was for.
Identified across four decades of peer-reviewed research by Dr. Robert Cialdini, seven million copies, forty-four languages.
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Commitment and Consistency is one of seven. Sixteen questions show which of them you lean on hardest, and name the one gap costing you the most.
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