  The evidence for electroweak radiative corrections not contained in
$\alpha(m_Z)$ is examined. At low energies there is very strong evidence in the
analysis of the unitarity of the CKM matrix. At LEP and collider experiments
the current direct signals are not strong, but there is substantial indirect
evidence, which will likely become sharper when $m_t$ is determined. The
advantage of using $(\Delta r)_{res}$ as a measure of these effects is
emphasized. In order to improve the direct evidence, more accurate measurements
of $m_W$ and the on--resonance asymmetries are indicated.
