Recent theories of glasses as out of equilibrium systems
  We discuss a theoretical approach to structural glasses as they happen in real situations. Older ideas based on `configurational entropy', on `fictive temperatures' and on Edwards' `compactivity' are sharpened and unified in an out of equilibrium context. The picture is such that it may be supported or disproved by an experimental test, which we describe. 
Jorge Kurchan (P.M.M.H. Ecole Sup\'erieure de Physique et Chimie   Industrielles)