  We discuss the phenomenology of third generation sfermions paying particular
attention to the implications of the Yukawa couplings and to the left-right
mixing. Analytical formulae are given for the sfermion mixing, the production
cross sections at e+e- colliders, and for all possible two body decay widths
that can occur at tree level. In case of the light stop stop we give in
addition the analytical formulae for the most important three body decay
widths. We give detailed numerical discussion of the various production cross
sections at LEP2 and a future e+e- Linear Collider. We discuss the various
decay channels paying particular attention on the decays into Higgs and vector
bosons, and on the three body decays of the light stop.
