1. Introduction
2. Assumptions
3. Evolution of bias for radio sources
4. Cosmological Probes
4.1 The Angular Power Spectrum
4.2 Cosmic Dipole, Isotropy and Homogeneity
4.3 BAO and RSDs with spectroscopic follow-up of emission-line sources
4.4 Integrated Sachs-Wolfe Effect
4.5 Cosmic Magnification Bias
4.6 Weak Lensing
5. The multi-wavelength requirements
5.1 Spectroscopic redshifts
5.2 Photometric redshifts
6. Survey requirements for SKA1
6.1 Deep
6.2 Medium-deep
6.3 Wide
7. Towards SKA2