The theory of strong interactions, QCD, is described in terms of a few
parameters, namely the strong coupling constant alpha_s and the quark masses.
We show how these parameters can be determined reliably using computer
simulations of QCD on a space-time lattice, and by employing a finite-size
scaling method, which allows to trace the energy dependence of alpha_s and
quark masses over several orders of magnitude. We also discuss methods designed
to reduce the effects of finite lattice spacing and address the issue of
computer resources required.Comment: Contribution to proceedings of NIC Symposium 2001, 13 pages, 7
figures, uses nic-series.cl
