This talk is based on my master's essay - a literature review of lattice methods for studying QCD in the perturbative regime. I will summarise the step scaling procedure devised by Lüscher et al: this is a finite-size scaling technique that allows the physics at high energies to be related to the low energy scales of the theory, with definite advantages over the standard method of computing the β-function. I will also discuss how the Schrödinger functional is used in particular to define and study the evolution of the renormalised gauge coupling from low to high energies.