  The proposed VLA Sky Survey (VLASS) comprises two distinct S-band (2--4 GHz)
surveys: (1) All-Sky covering the sky north of -40 deg with rms noise 69
microJy/beam = 1.5 K in the 2.5 arcsec beam and (2) Deep covering 10 square deg
with rms noise 1.5 microJy/beam = 0.32 K in the 0.8 arcsec beam. This review
compares the scientific goals and technical capabilities of the VLASS proposal
(2015 Jan 15 version), using new calculations of performance metrics for
surveys made with large fractional bandwidths.
