DETECTOR R&D

The next big project in high energy physics should be a high energy e+e- linear collider, operating at energies up to around 1 TeV. A vigorous RD the particle flow ansatz. This in turn influences significantly the design of a detector for such an experiment. Apart from work ongoing for the linear collider detector, preparations are under way for an update of the LHC. This requires extremely radiation hard detectors. In this paper the state of the different detector development projects is reviewed.