  We describe experimentally observed collective dynamics in colloidal
suspensions of model hard-sphere particles using a modified mode coupling
theory (MCT). This rescaled MCT is capable to describe quantitatively the
wave-vector and time-dependent diffusion in these systems. Intermediate
scattering functions of liquid-like structured dispersions are determined by
means of static and dynamic light scattering experiments. The structure and
short-time dynamics of the systems can be described quantitatively employing a
multi-component Percus-Yevick ansatz for the partial structure factors and an
effective, one-component description of hydrodynamic interactions based on the
semi-analytical $\delta\gamma$-expansion. Combined with a recently proposed
empirical modification of MCT in which memory functions are calculated using
effective structure factors at rescaled number densities, the scheme is able to
model the collective dynamics over the entire accessible time and wave-vector
range and predicts the volume-fraction-dependence of long-time self-diffusion
coefficients and the zero-shear viscosity quantitatively. This highlights the
potential of MCT as a practical tool for the quantitative analysis and
prediction of experimental observations.
