A diagnostic approach to increase reusable dinnerware selection in a cafeteria.

The team tested a three-part package in a college cafeteria. They moved reusable plates and cups to eye level, trained workers to say “Let’s go green,” and posted signs with planet facts.

They ran an ABAB reversal design. First they counted baseline dish use. Then they added the full package, removed it, and brought it back again.

When all three parts were in place, many more diners picked reusable dishes. The jump was larger than when only the dish location was changed.

Each time the package left, dish use dropped. Each time it returned, dish use rose again.

Sarber et al. (1983) and Delamater et al. (1986) show the same pattern: add a quick prompt and a cue, and people change mealtime choices. Those studies targeted child behavior and snack picks; this one shows the tactic works for adult green habits too.

Kodera et al. (1976) found one prompt plus a small $5 incentive beat three reminders. Here, no money was offered, yet behavior still rose. The difference is setting: dental clinics need an extra push; a busy lunch line moves with simple words and signs.

McConkey et al. (2010) paired prompts with raffle tickets at a bar and lifted designated-driver rates. Together these papers say: in community spots, a friendly sentence plus a visual nudge often does the job, with or without prizes.

You can cut plastic waste tomorrow without buying new tech. Ask the cafeteria manager to front-load reusables, give staff a 3-second script, and tape up one fact-based sign. Track dish use for one week—if it jumps, keep the package and share the data.