  It is possible to place direct constraints on WW-photon and WWZ couplings by
studying their tree-level contributions to the process e^+e^- ---> W^+W^-.
However, these couplings also contribute at the loop level to e^+e^- ---> f
fbar processes where `f' is any Standard-Model fermion. In this paper the
available LEP1.5 and LEP2 data, the anticipated LEP2 data and possible linear
collider data for these latter processes is combined with low-energy and Z-pole
data to place indirect constraints on nonstandard WW-photon and WWZ couplings.
The direct and indirect constraints are then compared. An effective Lagrangian
is used to describe the new physics. In order that the implications of this
analysis are as broad as possible, both the light-Higgs scenario, described by
an effective Lagrangian with a linear realization of the symmetry-breaking
sector, and the strongly interacting scenario, described by the electroweak
chiral Lagrangian, are considered.
