  We study the effects of QCD corrections to the process $e^+e^-\rightarrow
t\bar t+X\rightarrow b\ell^+\nu \bar b\ell^-\bar \nu+X$ above threshold. We
show how to treat consistently to ${\cal O}(\alpha_s)$ the gluon radiation in
both the production and the decay of the top quarks, while maintaining all
angular correlations in the event. At this order there is an ambiguity in the
event reconstruction whenever a real gluon occurs in the final state. We study
the effects of this ambiguity on the top mass and helicity angle distributions.
For a top mass of 175 GeV and collider energy of 400 GeV the gluon radiation is
emitted predominantly in the decay of the top quarks.
