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Summary form only given. The TANDEM project is a BMBF funded project with the goal to investigate several applications for wireless sensor networks i.e. in form of body area networks (BAN), automation networks, security networks etc. and develop a framework to construct such networks in a systematic and commercially feasible way. The approach of TANDEM to achieve these goals is to design a lego like set of building blocks that can be integrated to build a sensor node. Components like processors, radio frontends, sensorik blocks, crypto processors etc. build the hardware blocks. Software blocks are different OS for embedded systems, protocol stacks and middleware components. The talk will introduce first into the problems of smart sensor networks. It will describe different approaches of currently discussed architectures and topologies. Some standards will be introduced like the IEEE802.15.4 and the EN 13757-4 wireless MBus. The TANDEM approach will be outlined and some of the building blocks will be presented. The state and current results will be described and some aspects of future development will be discussed.