Group contingency interventions with children--1980-2010: a meta-analysis.

Little et al. (2015) pooled 50 single-case classroom studies published between 1980 and 2010.

They asked one question: how well do group contingencies cut problem behavior in school-aged kids?

Every study had to use dependent, independent, or interdependent group contingencies and measure behavior change with graphs.

The average effect was huge—an effect size of 3.41.

That means problem behavior dropped sharply in nearly every classroom that used any type of group contingency.

No single version (dependent, independent, or interdependent) stood out; all worked about equally well.

Weisman (1970) started the line: a simple token-based group contingency pushed class attention to 90%.

Herman et al. (1971) showed the same trick cuts preschool disruption to near zero when you add clear instructions.

Alba et al. (1972) seems to disagree—behavior-only contingencies helped behavior but not schoolwork.

The difference is focus: G et al. looked at problem behavior, while E et al. looked at academic output. Reinforce both if you want both to improve.

You can pick any group contingency style and expect big drops in disruption. Start tomorrow: set one class-wide goal, post the rule, and deliver a shared reward when the class hits it. Track behavior for one week; you should see a quick dip. If you also want better quiz scores, add a second contingency that pays for correct work, not just quiet seats.