No. 123 (00263) Family name : Vermaseren Given name : Jozef Affiliation : NIKHEF Abbreviation : E-mail address : t68@nikhef.nl Title : The rules of physics Authors : J. Vermaseren Abstract : Progress in perturbation theory depends on the one hand on better algorithms that make the calculations more compact. But much improvement has always be obtained by increased computer power. One bottleneck is the manpower involved in the derivation of the formulas needed in the computer programs. Calculations have to be done for existing accelerators and often one cannot wait for potentially more efficient and compact future algorithms. The question becomes then how we can have the computers help us constructing the programs. I will discuss this issue and show some similarities between this problem and elements of game theory.