Use unexpected rather than pre-committed rewards

Unexpected rewards after a good performance rarely undermine motivation; expected rewards often do.

Why it works

The overjustification effect depends on rewards being anticipated before the task: when you know the reward is coming, the expected reward becomes the reason you’re doing the activity, and that perception crowds out the intrinsic reason. Unexpected rewards are added after the activity, so there is no pre-existing external reason to compete with the intrinsic one. The activity remains self-attributed even after the reward.

How to do it

1. When designing incentives for intrinsically motivated work, decide on the reward after the performance.
2. Do not announce rewards in advance for tasks where intrinsic interest exists.
3. For recognition, make it specific and unexpected rather than a predictable schedule.
4. Reserve pre-committed rewards for tasks where intrinsic interest is low or absent.

Evidence

Deci et al.’s (1999) meta-analysis specifically distinguished unexpected rewards from expected ones: unexpected rewards did not undermine intrinsic motivation in the reviewed studies. (rct)

In practice, the expected/unexpected distinction is hard to maintain over time; a pattern of surprise rewards becomes expected, and the distinction erodes.

Sources

• Deci, Koestner & Ryan (1999), Psychological Bulletin

Common mistake

Creating a "surprise reward" system that becomes predictable — which transforms it functionally into an expected reward and reintroduces the overjustification risk.