Power Corrections at LEP
  The size of non-perturbative corrections to event shape observables is predicted to fall like powers of the inverse centre of mass energy. These power corrections are investigated for different observables from $e^+e^-$-annihilation measured at LEP as well as previous experiments. The obtained corrections are compared to other approaches and theoretical predictions. Measurements of $\alpha_s$ using power corrections are compared to conventional methods. 
Daniel Wicke (Bergische Universit\"at GH, Wuppertal)