GLASSES AND SPIN-GLASSES - A PARALLEL

We show that the classification of glasses from <<strong>> to <<fragile>> can also be applied to spin glasses. Fragile, intermediate and strong behaviours would mean different universality classes and the strong limit would correspond to a lower critical dimension in the framework of the current scaling approach. While the class of a spin glass seems to be attached to the frozen in anisotropy of the interactions, there are experimental signs in glass-forming systems that a strong regime is the result of a cross-over from a more fragile high-temperature situation. The same fact can also be interpreted as a cross-over towards a more anisotropic state or as a restriction of space dimensionality.