Why Precision?

Abstract

Precision measurements together with exact theoretical calculations have led to steady progress in fundamental physics. A brief survey is given on recent developments and current achievements in the field of perturbative precision calculations in the Standard Model of the Elementary Particles and their application in current high energy collider data analyses.

Comments: 30 papges, 8 fuigures, some style files, Proc. RADCOR 2011 Summary, a few references added