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In this chapter we provide an overview of the science enabled by radiocontinuum surveys in the SKA era, focusing on galaxy/galaxy cluster physics andevolution studies, and other relevant continuum science in the >2020 scientificframework. We outline a number of 'reference' radio-continuum surveys for SKA1that can address such topics, and comprehensively discuss the most criticalscience requirements that we have identified. We highlight what should beachieved by SKA1, to guarantee a major leap forwards with respect to thepre-SKA era, considering the science advances expected in the coming years withexisting and upcoming telescopes (JVLA, LOFAR, eMERLIN, and the three SKAprecursors: MWA, ASKAP and MeerKAT). In this exercise we take in due accountalso the other waveband facilities coming online at the same time (e.g. Euclid,LSST, etc.), which tackle overlapping scientific goals, but in a differentmanner. In this respect particular attention has been payed to ensure that theproposed reference surveys are able to exploit the existing synergies with suchfacilities, so as to generate strong involvement from all astronomicalcommunities, and leave a lasting legacy value. It is clear that a certaindegree of freedom is allowed to some of the observational parameters. Webelieve it is very important to best fine-tune such parameters taking intoproper account existing commensalities with SKA1 surveys addressing otherscience areas (HI galaxy science, magnetism, cosmology).

Revealing the Physics and Evolution of Galaxies and Galaxy Clusters with SKA Continuum Surveys