Sarah Leslie (Max Planck Institute for Astronomy) It is now well established that the star-formation activity of our Universe increased from the very early epochs, peaked around z=2, and then decreased by an order of magnitude until present age. However, the exact contribution of different galaxy populations to the total SFR budget is not yet well-defined. Further progress in this area requires both a better understanding (or calibration) of SFR tracers used as well as deep observations of such tracers. The…