AbstractThe thermally stimulated current (TSC) technique has been used to investigate three anionic polystyrenes of M̄n17,000, 71,700, and 1.55 × 106, i.e.,MTgappears to be theTllprocess and is designatedTMll. Relaxation times for it follow a Vogel equation.TMgandTMllvary with molecular weight, increasing belowMcand leveling off aboveMcat a temperature of about 170°C. Values ofTMgandTMllare compared with values ofTgandTllobtained from torsional braid analysis, which involves melt flow; and with differential‐scanning‐calorimetric values on fused films, where there is no transport of polymer. It is concluded from such cross‐comparisons that TSC, at least for polystyrene, is a quasistatic test which may involve microscopic viscosity. Macroscopic viscosity does not play a role. The ratioTMll/TMgis in the range 1.10–1.16, similar toTll/Tgvalues by other methods. A few comments aboutTllin atactic poly(methyl methacrylate) by the TSC meth