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The production of a t\bar{t}-pair and its decay into a 6 fermion final stateof different flavours in e+e- annihilation at centre of mass energies typicalfor linear colliders is analyzed in the framework of the Standard Model. Theresults of calculation based on exact matrix elements at the tree level andfull 6 particle phase space are compared with a few different approximations.It is shown that the effects related to off-shellness of the t\bar{t}-pair andbackground contributions are sizable both in the continuum and at thethreshold.Comment: 12 pages, 3 figures, references added, a comparison to existing  results improved, accepted for publication in Eur.Phys.J.

Top quark pair production and decay into six fermions at linear colliders