  A strictly linear evolution of the cosmological scale factor is surprisingly
an excellent fit to a host of cosmological observations. Any model that can
support such a coasting presents itself as a falsifiable model as far as
classical cosmological tests are concerned. This article discusses the
concordance of such an evolution in relation to several standard observations.
Such evolution is known to be comfortably concordant with the Hubble diagram as
deduced from current supernovae 1a data, it passes constraints arising from the
age and gravitational lensing statistics and just about clears basic
constraints on nucleosynthesis. Such an evolution exhibits distinguishable and
verifiable features for the recombination era. The overall viability of such
models is discussed.
