The fortification of cereal-based food rations is increasingly accepted to be the most efficient way of preventing micronutrient deficiencies in large refugee camps. Little is known, however, about the degree to which such foods are acceptable to refugees, or how they actually use them. These factors are important in considering how, and when the foods are fortified, before, during and after distribution. This working paper reports on field-based research into these questions. The conclusions are presented in a general summary report, which is supported by three detailed case studies.