The Premack Principle: Why First-Then Works

Every grandmother in history has run this experiment: "First eat your vegetables, then you can have dessert." No sticker charts, no prize box. Just one activity the child wants, placed carefully after one the child avoids. In 1959, a psychologist named David Premack worked out why that arrangement is so reliable, and teachers have been quietly using his principle every day since, often without knowing it has a name.

What is the Premack principle?

The Premack principle says that a more probable behavior can reinforce a less probable one. In plain terms: the things a person freely chooses to do a lot (drawing, chatting, playing outside) can serve as the reward for things they rarely choose, like long division.

Two details make this more useful than the usual "give rewards for work" advice:

• The reward is an activity, not a thing. You don't need a prize box. Your classroom is already full of reinforcers, and they're whatever your students do the moment you say "free choice."
• "Preferred" is defined by behavior, not by opinion. A high-probability behavior is one the student actually does often when free to choose, whatever we might have guessed. Most classroom versions go wrong right here.

Teachers usually meet the principle as first-then: first the task, then the preferred activity. Special educators have used first-then visual boards for decades. Everyone else calls it Grandma's rule.

From lab monkeys to nursery school

Premack's original 1959 studies weren't about classrooms at all. He was testing a general law of reinforcement, and found that the relative probability of behaviors determined which could reinforce which. He gave young children free access to a candy dispenser and a pinball machine, sorted them into "eaters" and "players" by what they did most, and then made each group's favorite contingent on the other activity: eaters had to play pinball to get candy, and players had to eat candy to unlock the pinball machine. Both groups did more of their less-preferred activity when their favorite was the payoff. Reinforcement, he argued, was a relationship between two behaviors rather than a fixed property of candy or praise.

The classroom application arrived fast. In 1963, Lloyd Homme and colleagues took over a small nursery school class of three-year-olds who ignored every instruction. Instead of fighting the running, screaming, and chair-pushing, the researchers made those the reward: sit quietly and attend for a few minutes, then the signal came to run and scream. Control of the class was, in their words, virtually complete within days. The behaviors driving the teacher up the wall turned out to be the most powerful reinforcers in the room.

How to run first-then well

1. Find the real high-probability behaviors

Watch what students choose during genuinely free moments. Not what they say they like — what they do. For one class it's drawing. For another it's helping the teacher, sitting by a friend, or five minutes on the rug with a puzzle. Speer and Maag's 2025 guidance for elementary classrooms makes the same point: the whole method rests on identifying activities students reliably choose, then restricting access so they follow the work.

2. Put the task first. Always.

"Five minutes of free time to settle down, then we'll do math" feels kind, but it runs the contingency backwards: the reinforcer is spent before the work begins. First the low-probability task, then the high-probability activity. The order is the entire mechanism.

3. Keep the "then" close and certain

A preferred activity promised for Friday afternoon does very little for Tuesday morning's worksheet. Short tasks, quick paydays, especially for younger students and doubly so while the routine is new. Reliability matters just as much: a "then" that sometimes doesn't happen stops working almost immediately.

4. Make it visible

Say it, write it, or show it: First reading response, then library corner. A two-panel first-then card is a fixture in special education for good reason: it removes the negotiation. The board made the deal, not you. That same clarity is what makes calm classroom transitions easier, because students always know what's next and why it's worth getting there.

The honest state of the evidence

The principle itself is old, replicated lab science. The applied literature is thinner than you'd expect for something taught in every behavior textbook. A 2023 review by Herrod and colleagues found that classroom applications often skip the step that defines the principle: verifying that the "preferred" activity is actually higher-probability for that student, rather than assuming it. That gap costs nothing to close: watch your students choose for a week, then build the routine on what you saw, because the observation step is where the effect lives.

Remember what first-then is for, too. It structures motivation that already exists in the room. Give students real choice in the "then" slot (the kind of autonomy we cover in student choice and autonomy) and the routine stops feeling like a bribe and starts looking like how adults manage their own effort: inbox first, coffee walk after.

First-then with classroom points

Points systems and the Premack principle fit together naturally. In Chou Chou Teach, points can be the bridge between first and then: students earn points for finishing the task, and the class spends them on the activities you've observed they love: extra recess minutes, a game from the Toolbox, music during cleanup. The activity is still the real reward. The points just make the path to it visible and immediate.

Start small this week. Notice one activity your class genuinely races toward, put one short task in front of it, and say the sentence out loud: first this, then that. Then watch who gets to work.

References

• Premack, D. (1959). Toward empirical behavior laws: I. Positive reinforcement. Psychological Review, 66(4), 219–233.
• Homme, L. E., deBaca, P. C., Devine, J. V., Steinhorst, R., & Rickert, E. J. (1963). Use of the Premack principle in controlling the behavior of nursery school children. Journal of the Experimental Analysis of Behavior, 6(4), 544.
• Herrod, J. L., Snyder, S. K., Hart, J. B., Frantz, S. J., & Ayres, K. M. (2023). Applications of the Premack Principle: A review of the literature. Behavior Modification, 47(1), 219–246.
• Speer, N. C., & Maag, J. W. (2025). Improving student behavior with restrictive access to high probability responses: The Premack principle in the elementary classroom. Intervention in School and Clinic, 61(1), 29–37.