In this volume recent developments in the nonperturbative aspects of string theory, duality in N = 1 string compactifications, orientifolds and F-theory as well as the matrix model description of M-theory are reported. The D-brane approach to black holes and their entropy is also discussed.The phenomenological part is devoted to the main fields of present-day astroparticle physics: supersymmetry, neutrino physics and cosmology. The two most important aspects of supersymmetry are covered: Searches for superpartners (G Kane) and mechanisms of supersymmetry breaking (G Dvali).Results from recent...