We compare experimental results for tube flow of polymer melts with those computed from Pao's theory. We further present a correlation scheme for the behavior of bulk polymer melts in steady flow and dynamic oscillatory experiments. The correlation is not limited to low shear rates, but is theoretically valid for all frequencies and shear rates. The steady flow shear viscosity is expected to equal or exceed the dynamic viscosity at all frequencies and shear rates. Similarly, the correlation predicts thatGexceeds or equalsG′over the entire frequency range. At low shear ratesτ12should correlate withG″andP11−P22is given by2G′.Limited agreement between the experimental results and computed curves for tube flow is observed. The correlation scheme appears to represent the behavior of certain polymer solutions very well but quantitative agreement is not obtained for a linear polyethylene melt. We propose that changes in the relaxation spectrum of the polymer melt subjected to steady shearing can account for the discrepancies.