Ambulatory care supporting long-term treatment of type I diabetes mellitus (DM) is based on the analysis of daily notes of serum glucose measurements, carbohydrate intake, and insulin dosage. In order to improve glycaemic control, telemedicine support aims at improving communication between patients and diabetologists. Patient data are collected using mobile phone services. Weekly responses from the diabetes care centre should help the patient to optimize glycaemic control. The telemedical support system VIE-DIAB integrates data collection, visualization, and recommendation handling by using mobile phone and internet services. Its core is a module which visualizes a summary of the patient’s diary data of the last 4 weeks. Traditional methods for displaying these data mainly use (coloured) scatter plots, line graphs or summary histograms to give a graphical overview of the data. VIE-DIAB supports a more intuitive view by presenting 4x7 multiples. Each multiple represents the serum glu...