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Many of the most important and challenging problems§in modern solid state physics are in the regime where§both the electron-electron interaction and disorder§effects appear to be equally important. The dynamical§mean field theory is ideally suited to treat both of§these effects on equal footing. This book presents a§theoretical study of several aspects of behavior of§strongly correlated electron systems with disorder.§First the influence of strong electron-electron§interactions on the impurity dominated resistivity is§examined and a possible relevance of the results for§the physics of high mobility MOSFETs is discussed.§Second part of the book describes a mechanism of§disorder-driven non-Fermi liquid behavior in heavy§fermion systems. The interplay of the Kondo effect§and the RKKY interactions in disordered systems is§examined §within an extended dynamical mean field theory methods.