A large municipal housing association is seeking to improve recycling accuracy and reduce the contamination of dry recyclable waste bins across its residential estates. The following two behavioral intervention schemes have been proposed:

• Proposal A (Social Norms & Feedback): Attaching colour-coded feedback tags ("Correctly Sorted!" or "Contaminated Bin") to individual household bins after collection, combined with a monthly community newsletter displaying the recycling accuracy of each street compared to neighboring streets.
• Proposal B (Choice Architecture & Affordances): Redesigning the public collection bin lids to have shape-restricted apertures (e.g., thin slits for cardboard, circular holes for cans) and distributing free, pre-labelled sorting caddies to all households for indoor use.