The reduction of stealing in second graders using a group contingency.

The researchers tested a group contingency in three second-grade classrooms.

If no one stole anything that day, the whole class earned extra free time.

If items were missing, the class lost free time until the items were returned.

A simple lecture about stealing had no effect, so the contingency was added.

Stealing dropped to zero in every class once the free-time rule began.

The teachers did not single out any child; the whole class won or lost together.

When the rule was lifted, stealing returned, showing the contingency was the key.

Garcia et al. (1971) used the same free-time loss but signaled it with a desk light for one disruptive boy. The 1977 study moves from one child to the whole class and targets stealing instead of disruption.

Chinnappan et al. (2020) later swapped tangible rewards for rules and visual feedback with adolescents. Both studies show group contingencies work, but the newer paper proves you can use social feedback alone with older youth.

Sobsey et al. (1983) scaled the idea even bigger, cutting vandalism costs across 18 schools. The classroom trick shown here grew into full school-wide programs.

You can curb stealing, or any rule-breaking, without naming names.

Tell the class: "If everything is here at 2 p.m., we all get five extra minutes of recess."

Start the timer, tally the items, and let the group earn or lose together.

No tokens, no tickets, just shared free time.