Aberdeen City Council officials are to quiz thousands more residents about their recycling habits.
Officials will visit about 10,000 homes across the city, in areas where food bins have been in place for the past six months.
They will also visit halls of residence at Aberdeen and Robert Gordon universities to speak to students about the food recycling service.
The exercise is aimed at encouraging people who live in flats to make use of their food bins.
Council chiefs say there has been strong uptake of the food recycling service, with more than 500 tonnes of waste recycled using communal bins across Aberdeen in 2014.
In the first phase of the campaign in October 2014, the Council surveyed 1,800 residents of multi-storeys and tenements about the food recycling service, and found about three-quarters of them were using the service.
Return of the bin police? Thousands of Aberdeen people to be quizzed on recycling habits