Tähteitä Nolla! – campaign challenges primary school students to appreciate food and reduce the amount of food leftovers. Schools get campaign materials which instruct students how to reduce the amount of food left over and instructions how to participate. Kitchen personel play a key role in the campaign. They measure the amount of leftover food during the week and fill a participation form including questions “What was for lunch at the school today?”, “Amount of organic waste” and “The number of eaters”. After a week the forms are returned and results analyzed and a press release will be issued based on the results.