  We list all possible dim=6 CP conserving and SU(3)* SU(2)*U(1) gauge
invariant interactions, which could be generated in case no new particles would
be reachable in the future Colliders, and the only observable New Physics would
be in the form of new interactions affecting the scalar sector and the quarks
of the third family. These interactions are described by operators involving
the standard model scalar field, the quarks of the third family and the gauge
bosons. Subsequently, we identify those operators which do not contribute to
LEP1 (and lower energy) observables at tree level and are not purely gluonic.
Since present measurements do not strongly constrain the couplings of these
operators, we derive here the unitarity bounds on them. Finally, in order to
get a feeling on the possible physical meaning of the appearance of any of
these operators, we identify the operators generated in a class of
renormalizable dynamical models which at the TeV scale, are fully described by
the SU(3)*SU(2)*U(1) gauge group.
