  Radio continuum surveys have, in the past, been of restricted use in
cosmology. Most studies have concentrated on cross-correlations with the cosmic
microwave background to detect the integrated Sachs-Wolfe effect, due to the
large sky areas that can be surveyed. As we move into the SKA era, radio
continuum surveys will have sufficient source density and sky area to play a
major role in cosmology on the largest scales. In this chapter we summarise the
experiments that can be carried out with the SKA as it is built up through the
coming decade. We show that the SKA can play a unique role in constraining the
non-Gaussianity parameter to \sigma(f_NL) ~ 1, and provide a unique handle on
the systematics that inhibit weak lensing surveys. The SKA will also provide
the necessary data to test the isotropy of the Universe at redshifts of order
unity and thus evaluate the robustness of the cosmological principle.Thus, SKA
continuum surveys will turn radio observations into a central probe of
cosmological research in the coming decades.
