The contributions cover topics and problems under research in high-energy particle physics and quantum field theory, in particular: string theory and M-theory; grand unification; quantum gravity and cosmology; standard and noncommutative quantum field theory.Some papers concern more mathematical topics, such as the integrability topology of gauge groups and operator matrices.The contributors are leading international scientists, such as G Arutyunov, K Behrndt, G Cardoso, M Chaichian, G Lazarides, D Luest, N Kaloper, G Senjanovi?, and J Wess, with an emphasis on researchers from South-East Europe, including B Bajc, A Mikovic and B Sazdovic."