Prospects of measuring general Higgs couplings at e(+)e(-) linear colliders

We examine how accurately the general HZV couplings, with V = Z, gamma, may be determined by studying e(+)e(-) --> Hf (f) over bar processes at future e(+)e(-) linear colliders. By using the optimal-observable method, which m akes use of all available experimental information, we find out which combi nations of the various HZV coupling terms may be constrained most efficient ly with high luminosity. We also assess the benefits of measuring the tau-l epton helicities, identifying the bottom-hadron charges, polarizing the ele ctron beam and running at two different collider energies. The HZZ coupling s are generally found to be well constrained, even without these options. w hile the HZ gamma couplings are not. The constraints on the latter may be s ignificantly improved by beam polarization.