  Radiative corrections to the process e+ e- to t tbar are calculated in
one-loop approximation of the Standard Model. There exist results from several
groups. This talk provides further comparisons of the complete elektroweak
contributions, including hard bremsstrahlung. The excellent final agreement of
the different groups allows to continue by working on a code for an event
generator for TESLA and an extension to e+ e- to 6 fermions.
