Differential effects of fixed- and variable-time feedback on production rates of elementary school children.

The researchers compared two ways of sending work reports home. One group of elementary students got a fixed weekly report every Friday. The other group got the same report on random days.

The teachers used an alternating-treatments design. Each week switched between fixed and random schedules. They tracked how many assignments students finished each day.

Random-day reports won. Students finished more work when they did not know which day the note would go home. Daily completion stayed steady instead of dropping off after report day.

Fixed weekly reports created a seesaw pattern. Work spiked right before Friday then fell. Variable timing kept effort even across the whole week.

Anger et al. (1976) used daily report cards to cut disruptive behavior. Their note went home every day, same as the variable group here. Both studies show a daily note keeps behavior strong.

Lovitt et al. (1970) tested math work under single versus multiple-ratio token plans. Like the present study, switching from one steady schedule to several changing schedules boosted student output.

Hursh et al. (1974) doubled writing speed with public feedback plus a stopwatch. Their feedback was immediate and loud. The 1977 note was private and delayed, yet still lifted work. Together they show timing and publicity can both help, but neither is required.

You can raise work completion without extra class time or prizes. Pick two random days each week to send the home report instead of always Friday. The surprise keeps kids working every day. Try it next week: flip a coin each morning. Heads sends the note, tails waits until tomorrow.