A sample of 142 diabetic patients was interviewed twice, in 1984 and 1986, following an educational program administered to primary care staff. Positive changes were recorded regarding several aspects. (a) Process of care - the percentage of untreated patients decreased from 15% to 4%; the proportion of patients on diet only increased from 36% to 41%, while the insulin-treated proportion decreased from 12% to 8%; the percentage of patients treated with oral drugs went up from 36% to 46%. (b) Patient knowledge - an improvement in various aspects, such as diet and exercise. (c) Patient behavior - an improvement in adherence to diet and in compliance with medications.