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F. Germany-), . Verdjo, T. Barros, G. Read-spain-), and . Baron, The finally responsibility of this document is of course entirely ours and we do not guarantee that this document reflect their views. Thanks to our colleagues A (Iceland) and colleagues from TECFA. A cretain number of teachers have also helped us by commenting a set of questions, M. Rigo (Italy), A.P. Martins (Portugal), Ian Hughes (UK), J. Koivisto (Finland), K. Sarnow (Germany), H. De Four (Belgium), J. Poot (Belgium), P. Somers (Ireland), H. Arzt (Austria), P: Ronchi (Italy), P. Levänen (Finland). Special thanks to A. Piguet (TECFA) for her help with language for the first version