Foundations and Scope of Chiral Perturbation Theory
  The aim of this introductory lecture is to review the arguments, according to which the symmetry properties of the strong interaction reveal themselves at low energies. I first discuss the symmetries of QCD, then sketch the method used to work out their implications and finally take up a few specific issues, where new experimental results are of particular interest to test the predictions. (Talk given at the Workshop "Chiral Dynamics: Theory and Experiment", July 1994, MIT, BUTP 94/18) 
H. Leutwyler