12 Years of Precision Calculations for LEP. What's Next?

I shortly review time period of twelve years, 1989-2000, which was devoted to a theoretical support of experiments at LEP and SLC at Z resonance and discuss several directions of possible future work in the field of precision theoretical calculations for experiments at future colliders.Comment: 11 Latex, including 1 figures. Updated version as appeared in the Journa

Monte Carlo Calculation of the Multiple Scattering of the Electron

The behavior of an electron in a thick Al layer is studied by the Monte Carlo method, assuming that the track of the electron is simplified by an approximate model, and the penetration and backscattering probability are obtained from a set of hundred histories. The consistency of the value of the practical range of the electron obtained by this calculation with that of the empirical formula proved that the method is quite adequate for solving the pentration and backscattering problem of the electron through a thick layer