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We propose that the salient feature to be explained about the glasstransition of supercooled liquids is the temperature-controlled superArrheniusactivated nature of the viscous slowing down, more strikingly seen inweakly-bonded, fragile systems. In the light of this observation, the relevanceof simple models of spherically interacting particles and that of models basedon free-volume congested dynamics are questioned. Finally, we discuss how themain aspects of the phenomenology of supercooled liquids, including thecrossover from Arrhenius to superArrhenius activated behavior and theheterogeneous character of the $\alpha$ relaxation, can be described by anapproach based on frustration-limited domains.Comment: 13 pages, 4 figures, accepted in J. Phys.: Condensed Matter,  proceedings of the Trieste workshop on "Unifying Concepts in Glass Physics

journal of physics. condensed matter

The viscous slowing down of supercooled liquids as a temperature-controlled super-Arrhenius activated process: a description in terms of frustration-limited domains