There’s a motivation trick so old that grandmothers were using it long before anyone studied it. Finish your vegetables, then you get dessert. First the thing you’d avoid, then the thing you want.
In 1965 a psychologist named David Premack formalized it, and it’s been known as the Premack principle ever since. The idea is simple: a behavior your kid would freely choose can be used to reinforce a behavior they’d rather skip, as long as the wanted thing comes after the unwanted one.
Why the order matters so much
The magic is entirely in the sequence. “First, then” works. “Then, first” doesn’t.
If a kid gets the reward first (“you can play now, just do your reading later”), the motivation evaporates the moment the fun begins. There’s nothing left to pull them through the boring task. Flip it, and the boring task becomes the gateway to something they actually want. Same two activities, completely different outcome, purely because of order.
Imagine a kid who has to do 20 minutes of reading before the next part of a game unlocks. The reading isn’t being punished or bribed away. It’s the key. Suppose the game is genuinely exciting to them. Most kids will do the 20 minutes, not because they suddenly love reading, but because the thing on the other side is worth it.
The one detail everyone gets wrong
Here’s the catch that makes or breaks it: the reward has to be something your kid genuinely, strongly wants.
This sounds obvious, but it’s where most reward systems quietly fail. A sticker is not a strong reward to a seven-year-old who has forty stickers. Ten more minutes of a show they’re lukewarm about won’t move them. If the “then” is weak, the “first” won’t happen.
So before you set up any first-then deal, ask the honest question: does my kid actually want this reward, a lot? If the answer is “sort of,” the system will sputter. If the answer is “they’d do almost anything for it,” you’ve got real leverage.
A second detail: don’t kill what they already love
One warning. Premack works best on activities your kid finds genuinely unappealing. If you take something they already love and turn it into the reward, or worse, the chore, you can accidentally drain the fun out of it.
The classic example is reading. If your kid already disappears into books, don’t make books the task they have to grind through to earn screen time. You might trade a lifelong reader for a kid who now sees reading as work. Save the first-then structure for the genuinely dull stuff, and protect the things they’d do on their own.
How to use it this week
You don’t need an app for this. Try one small first-then deal:
- Pick one task your kid avoids.
- Pick one reward they genuinely love.
- State it plainly: “First the task, then the reward.” No negotiation on order.
- Hold the line. The reward comes after, every time.
That’s the whole thing. It’s not a hack or a trend. It’s a 60-year-old principle that grandmothers ran on instinct, and it still works, as long as the reward is good enough to be worth the effort.