Performing a capture rate study is a good way to evaluate how well participants are doing at diverting all compostable materials from their homes.
To accurately measure the capture rate of all compostable materials, sorting garbage, recycling, and organics is needed. Food scraps and other compostable items can end up any of the three streams. Paper towels and compostable food-service containers often end up in the recycling and garbage.
Check the Curb to Compost Toolkit from CREF on our Resources Page for more info.