Results are presented from a study of the structure of 
high energy hadronic events recorded by the L3 detector at $\sqrt{s}\ge$ 192 GeV. 
The distributions of several event shape variables are compared
 to   resummed  $\cal{O}$$(\alpha_{\rm s}^{2})$ QCD calculations.
We determine the strong coupling constant at three average centre-of-mass 
energies: 194.4, 200.2 and 206.2 GeV.
These measurements, combined with previous L3 measurements at lower energies,
demonstrate the running of $\alpha_{\rm s}$ as expected in QCD 
and yield $\alpha_{\rm s} (m_{\rm Z})$ = 0.1227 $\pm$ 0.0012  $\pm$ 0.0058,
 where the first uncertainty is
experimental and the second is theoretical.