Behavioral school psychology goes outdoors: the effect of organized games on playground aggression.

The team ran recess games for 344 K-2 kids at one school. They used an ABAB reversal: baseline, games, back to baseline, games again. The games were simple—rope jumping and foot races—with only rare timeout for hitting or pushing.

Aggressive acts were counted each recess by trained observers.

Aggression dropped every time the games returned. The reversal pattern showed the games, not luck, caused the change. Occasional timeout was enough; teachers did not chase every child.

The effect held for the whole grade, not just a few kids.

Yassine et al. (2021) asked the same question 40 years later. They swapped games for a token economy and still saw big cuts in aggression. The problem is still alive; the tool can change.

Chotto et al. (2024) ran a sharper test of group games. Their Good Behavior Game with feedback gave larger, faster drops in disruption. The 1983 study showed the idea works; the 2024 study shows how to make it stronger.

Allison et al. (1980) tried timeout plus toy play with one aggressive boy at home. The target paper moved the same mix outside with 344 kids. Small-case seed, large-scale bloom.

You can cut playground aggression without writing 300 behavior plans. Schedule jump-rope or relay races, add brief timeout for the rare hit, and watch the data fall. Use the reversal design for quick proof; if aggression rises when games stop, you know the games are the key lever.