CC10 at ${\cal O}(\alpha_s )$: QCD corrections to $e^+ e^- \to \mu^-   \bar \nu_\mu u \bar d$ at LEP2 and the Next Linear Collider
  QCD one-loop corrections to the semileptonic process $e^+ e^- \to \mu^- \bar \nu_\mu u \bar d$ are computed. We compare the exact calculation with a ``naive'' approach to strong radiative corrections which has been widely used in the literature and discuss the phenomenological relevance of QCD contributions for LEP2 and NLC physics. 
E. Maina (1), R. Pittau (2) and M. Pizzio (1) ((1) U. of Torino and   INFN-Torino, IT, (2) PSI, Villigen, CH)