Introduction (Sir Nevill Mott). 1. Electron-electron interaction in disordered conductors (B.L. Altshuler and A.G. Aronov). 2. Interaction effects in the weakly localized regime of two- and three-dimensional disordered systems (H. Fukuyama). 3. A review of the metal-insulator transition in doped semiconductors (R.F. Milligan, T.F. Rosenbaum, R.N. Bhatt and G.A. Thomas). 4. The effect of Coulomb interactions on electronic states and transport in disordered insulators (M. Pollak and M. Ortuño). 5. Coulomb interaction in disordered systems with localized electronic states (A.L. Efros and B.I. Shklovskii). 6. H--like impurity centers, molecular complexes and electron delocalization in semiconductors (E.M. Gershenzon, A.P. Mel'nikov and R.I. Rabinovich). 7. Electron-electron interactions in the Anderson-localized regime near the metal-insulator transition (H. Kamimura). 8. Disorder and interactions in the system of quasi one-dimensional electrons (L.P. Gor'kov). Author index. Subject index.