NLO QCD CORRECTIONS TO THE PRODUCTION OF OFF-SHELL WW PAIRS AT E(-) COLLIDERS()E()

QCD corrections to e(+)e(-) --> WW --> q(1)<(q)over bar (1)>q(2)<(q)ov er bar (2)> are computed and presented in a form which allows to impos e realistic cuts on the structure of the observed events. QCD radiatio n substantially modifies the jet-jet invariant mass distributions from which the value of the W mass will be extracted. When the range of al lowed jet-jet masses is restricted, as it has been proposed in order t o suppress non-WW backgrounds, the total cross section is also deeply affected. If all events are forced to four jets, combining the two par tons with smallest invariant mass, and the reconstructed masses are re quired to satisfy \M(Ri) - M(W)\ less than or equal to 10 GeV i = 1,2 the lowest order cross section can be reduced by more than 40%.