  The transitions in disordered substances are discussed briefly:
liquid--liquid phase transitions, liquid--glass transition and the
transformations of one amorphous form to another amorphous form of the same
substances. A description of these transitions in terms of many--particle
conditional distribution functions is proposed. The concept of a hidden long
range order is proposed, which is connected with the broken symmetry of higher
order distribution functions. The appearance of frustration in simple
supercooled Lennard--Jones liquid is demonstrated.
