Tom Krieglstein explains how the consistency principle works: people follow through on commitments to avoid cognitive dissonance. When university orientation students write down three clubs they might join, they're far more likely to actually join those clubs later at recruitment fairs.
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The consistency principle states if we commit to doing something earlier in the day or week, we're more likely to do that action later. When presented with the opportunity to do the action or not. It's because we don't want to have friction in our brain between things we said we were going to do and actually doing them or not doing them. So how can that play out? Well, let's say you're at a university, maybe at new student orientation, you can have every student fill out a sheet of paper that says what clubs they might be interested in joining. And they have to choose three. So they go down the full list, they check for student government, they check for the soccer club, they check for the green club, and then fast forward to the next day and they're at the club recruitment fair. And there in the big room is the student government, is the soccer club, is the green club, and they see those. And because they already said they were interested in joining, it'll increase the chances of them joining that club or organization. Getting that pre commitment is key to future action.