To a degree never known before, human decision makers or decision making systems have access to a vast amount of data. For making use of this information potential, real-time data streams must not overwhelm the actors involved. On the contrary, the data are to be fused to high-quality information to provide decision support on various hierarchy levels. Being a challenging exploitation technology at the common interface between sensors, command & control systems, data and information fusion has a large potential for future security and ISR systems (Intelligence, Surveillance, Reconnaissance) in defence and civilian applications. Scope Sensor Data Fusion techniques provide higher-level information from multiple sensor data by spatio-temporal data integration, the exploitation of redundant and complementary information, and the available context. This growing branch of applied informatics aims at the production of comprehensive, precise, and near real-time situation pictures, which are basic for further decisions or actions. Important applications exist in logistics, advanced driver assistance systems, medical care, public security, defence, aerospace, robotics, industrial production, precision agriculture, trac monitoring.