This study shows the results of working with a computerized system which stores values of blood glucose, insulin, diet and exercise and demonstrates which diabetic patients are suitable for continuous monitoring. The recording of blood glucose as well as the insulin doses, diet and exercise correlated to time is more accurate and easier than the usual protocolling of data. Deficiencies in diet, exercise or insulin regimens are detected more easily by evaluation of data with a computerized system, for example by making an average profile of a day. These results have a strengthening effect: Well controlled diabetic patients are ambitious to further improve their blood glucose control. Poorly controlled diabetics appear to be frustrated by this kind of unfailing control.