Int. J. Environ. Res. Public Health 2009, 6 Study 1: the FIFI-study: data of teachers and principals Eighty schools in East- and West-Flanders, randomly selected from the school list provided by the Ministry Department of Education, were approached for participation. Forty-six schools and ten sub- departments agreed to participate. The principals were asked to fill in a short school food policy questionnaire and the teachers of the participating classes (n = 90) were asked to fill in a teachers‟ questionnaire. Data collection was carried out during January–April 2008. A more detailed description of the FIFI can be found elsewhere [16]. Study 2: Beastly Healthy at school: data of parents Four hundred and three schools in East-Flanders were e-mailed asking them whether they would be willing to participate in an intervention study to promote healthy eating, bearing in mind that there was a 50% chance that they would be randomized to control condition: 40 schools agreed to participate. Sixteen schools (eight control and eight intervention) were randomly selected. All parents of the pupils of the selected schools (n = 1,432) were asked to fill in a questionnaire including their socio- demographic characteristics, items related to the school food policy, and a food frequency questionnaire. It was explicitly asked that the parent who spent most time with the child outside school completed the questionnaire. The data was collected in September 2006. The impact of the intervention study and a more detailed description of the study have been described elsewhere [17]. 1270 2.2. Material 2.2.1. School food policy questionnaire Principals were asked to indicate for a list of foods and beverages if they were available DAILY at school, during morning breaks, lunch and/or afternoon breaks. For a selection of items, they had to indicate whether they were “allowed”, “never allowed” or “occasionally allowed (e.g. on birthdays)”. Concerning fruit availability, principals were asked: (1) if there was “a fruit day” at school (“no”, “yes”), (2) if fruit was available at school, not taking into account fruit offered as part of a meal (“no or less than once a week”, “once a week”, “2-3 days a week”, “daily or almost daily”), and (3) how often fruit was available as dessert for those who ordered a hot meal at school (“no hot meal offered at school”, “not or less than once a week”, “once a week” “2-3 days a week”, and “daily or almost daily”). 2.2.2. Teachers‟ and parents‟ school food policy opinions questionnaire The school food policy opinions questionnaire was developed by the authors (including a communication expert, a pedagogue, a psychologist, and a pharmacist) and covered a broad range of school-food policy related issues such as education, communication, restriction rules, availability of food, and satisfaction. For a detailed description of the items see Table 2 (the original questionnaire is in Dutch). Each item had to be responded on a 5-point scale ranging from completely disagree to