Experimentation and Physics at a Future Electron-Positron Linear   Collider
  I summarise the physics opportunities and experimental challenges at future Linear Colliders, using material from the recent ECFA/DESY workshop on the subject as well as contributions to the series of worldwide studies. For reasons of economy, the discussion is restricted to the European Tesla project and to its electron-positron mode only. 
Martin Pohl (University of Geneva and University of Nijmegen)