An overview is given of recent tests of the mode-coupling theory for the ev
olution of structural relaxation in glass-forming liquids. Emphasis is put
on comparisons between the leading-order asymptotic formulae derived for th
e dynamics near glass transition singularities and the results of neutron s
cattering, depolarized light scattering, impulsive stimulated light scatter
ing and dielectric-loss spectroscopy for conventional liquids. The tests ba
sed on photon-correlation spectroscopy results for the glassy dynamics of c
olloids and the findings of molecular dynamics simulations for model system
s are also considered.