 All primary care centers in Stockholm County approximately 200 are randomised to control or intervention receiving structured feed back on detection rate of stroketransient ischemic attacks in comparison to hospital discharge registry data. The randomisation is done group wise based on training areas. A data set is presented by different means; 1 in written reports, directly to the head of each primary care center in the intervention group 2in oral presentation on training sessions for the physicians in each training ares. Measures of detection rates of diagnosis and dispensed prescriptions of secondary preventive drugs are made before start of the project and after one year. The control group, ie the primary care centers not receiving feed back, are measured in the same way and thus provide a control group. The hypothesis being that with visibility of the problem, it is easier to improve care wich is what all health providers aim to do. 