Jets in Deep-Inelastic Scattering at HERA and determinations of   $\alpha_s$
  Several methods to extract the strong coupling constant $\alpha_s$ by means of highly energetic jets in Deep-Inelastic Scattering are presented. The results from the various methods agree with one another and with the world average. The errors are competetive to those achieved in $\alpha_s$ determinations in other processes such as proton--anti-proton scattering. 
Roman Poeschl (On behalf of the H1 and ZEUS Collaborations)