The Australian Square Kilometre Array Pathfinder (ASKAP) will give us an unprecedented opportunity to investigate the transient sky at radio wavelengths. In this paper we present VAST, an ASKAP survey for Variables and Slow Transients. VAST will exploit the wide-field survey capabilities of ASKAP to enable the discovery and investigation of variable and transient phenomena from the local to the cosmological, including flare stars, intermittent pulsars, X-ray binaries, magnetars, extreme scattering events, interstellar scintillation, radio supernovae, and orphan afterglows of gamma-ray bursts. In addition, it will allow us to probe unexplored regions of parameter space where new classes of transient sources may be detected. In this paper we review the known radio transient and variable populations and the current results from blind radio surveys. We outline a comprehensive program based on a multi-tiered survey strategy to characterise the radio transient sky through detection and monitoring of transient and variable sources on the ASKAP imaging timescales of 5 s and greater. We also present an analysis of the expected source populations that we will be able to detect with VAST.

The growth of business classes in Africa has attracted much interest since the 1980s when, in the context of severe economic malaise, the impact of the state on development was subjected to critical reappraisal.1 Out of this emerged a consensus that the abysmal economic record of the 1960s and 1970s could, to a large degree, be ascribed to the debilitating effect of an overstretched and swollen state. Official development thinking took this argument the furthest: at the core of the problem, it was asserted, was the expansion of the state's rôle from the preferred minimalist function of providing the legal and macro-economic regulatory framework for capital accumulation, to a more profound intervention in the productive process. As a remedy, the state would have to be restrained from usurping the primary rôle which the market's invisible hand ought to be playing.2