I was wondering how other municipalities implemented this type of program using CBSM. Our plan is to audit to gain data, stick stickers on carts that are sorting correctly (food scraps/recycling), place an oops tag on carts that are not sorting at all or high contamination. We will then use this data to chat with residents about how to use their carts and the waste system properly, using one small asks and auditing if the change has occurred. The durable commitment will look like a verbal commitment 'can I count on you to?' with positive reinforcement for those sorting correctly/using their cart.
I love the sticker idea. Feedback is helpful, both positive and negative. It sounds like when residents have not sorted correctly, you are gently nudging them to let them know that, which is great. Waste auditing will definitely yield useful data, though I'm wondering if you are also checking for barriers and benefits (CBSM step #2)? That is, when residents are not sorting correctly, will you know why? It will be interesting to see if anyone else has implemented this type of campaign, and what the results were from that.