  We present Standard Model predictions for the complete set of
phenomenologically relevant electroweak precision pseudo-observables related to
the Z-boson: the leptonic and bottom-quark effective weak mixing angles
$\sin^2\theta_{\rm eff}^\ell$, $\sin^2\theta_{\rm eff}^b$, the Z-boson partial
decay widths $\Gamma_f$, where $f$ indicates any charged lepton, neutrino and
quark flavor (except for the top quark), as well as the total Z decay width
$\Gamma_Z$, the branching ratios $R_\ell$, $R_c$, $R_b$, and the hadronic cross
section $\sigma_{\rm had}^0$. The input parameters are the masses $M_Z$, $M_H$
and $m_t$, and the couplings $\alpha_s$, $\alpha$. The scheme dependence due to
the choice of $M_W$ or its alternative $G_\mu$ as a last input parameter is
also discussed. Recent substantial technical progress in the calculation of
Minkowskian massive higher-order Feynman integrals allows the calculation of
the complete electroweak two-loop radiative corrections to all the observables
mentioned. QCD contributions are included appropriately. Results are provided
in terms of simple and convenient parameterization formulae whose coefficients
have been determined from the full numerical multi-loop calculation. The size
of the missing electroweak three-loop or QCD higher-order corrections is
estimated. We briefly comment on the prospects for their calculation. Finally,
direct predictions for the $Z{\bar f}f$ vector and axial-vector form-factors
are given, including a discussion of separate order-by-order contributions.
