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The study is restricted to an interpretation of most of the publications, developed by about twenty groups, on the steady and dynamic flow behavior of undiluted, high molecular weight and linear polystyrenes at temperatures near 200C. Importantly, different workers have studied similar, and, in many cases, identical samples. The polystyrenes evaluated fall into three categories--the Dow series, other narrow distribution polystyrenes, and, finally, other defined polystyrenes which are generally of broader distribution. The advent of anionic polymerization (living polymers) has made possible the wide dissemination of sizeable amounts of narrow distribution polystyrenes. These polymers have frequently been referred to as monodisperse which, simple calculations indicate, is far from the case. (Author)