“…It is worth observing that most of the well-known models of Einstein's theory and Brans-Deke theory with curvature parameter k = 0, including inflationary models, are models with constant deceleration parameter. In earlier literature cosmological models with a constant deceleration parameter have been studied by Berman [11], Berman and Gomide [12], Johri and Desikan [13], Singh and Desikan [14], Maharaj and Naidoo [15], Pradhan and et al [16] and others. But redshift magnitude test has had a chequered history.…”