  There have been a great deal of works on the precision test of the standard
model (SM) because of the incredibly precise data obtained at the LEP and the
new measurements of $M_W$ and $m_t$ at the Fermilab Tevatron as well as the
recent theoretical progress in the higher order radiative corrections. We will
discuss some of the hidden inputs and theoretical uncertainties involved in
making the predictions of the observables in the SM. From the minimal
$\chi^2$-fit to the experimental Z-decay parameters (with the aid of a modified
ZFITTER program) in a scheme where $M_Z$, $G_{\mu}$ and $\alpha (M_Z)$ are
taken as inputs, we can predict $M_W$ for given values of $m_H$ and $m_t$. The
current world average value of $M_W$ definitely favor nonvanishing electroweak
radiative corrections and is consistent with a heavy $m_t$ as measured by the
recent CDF report but with a heavy Higgs scalar of about 500 GeV within the
context of the minimal SM. The sensitivity of and the errors in the best fit
solutions due to the uncertainties in the gluonic coupling $\alpha_s(M_Z)$ and
$\alpha (M_Z)$ are examined carefully and any trace of new physics beyond the
SM implied by the data, in a particular $R_b$ and $R_c$, is also touched upon.
In addition we discuss how the future precision measurements of $M_W$ and $Z$
decay parameters can determine the Higgs boson mass and distinguish the SM with
radiative corrections from the minimal supersymmetric standard model (MSSM) and
other extended model.
