A glassy material is treated as a mosaic of soft and hard clusters. Plastic shear under high shear stress takes place in soft clusters as a series of elementary local slip and stick processes; stress-strain relations are discussed in terms of these elementary acts and their activation energies. Two special situations are considered: a glass where the initial distribution of soft clusters is created by damaging irradiation or other factors, and disappears in the process of shear, and a glass where interaction of soft and hard clusters maintains a time-independent distribution of activation energies.

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