Contents: T. Datuashvili: Homological dimension of extensions of abelian categories and rings.- J. Gubeladze: Classical algebraic K-theory of monoid algebras.- H. Inassaridze: K-theory of special normed rings.- G. Janelidze: Cohomology and extensions of internal modules.- M. Jibladze: Coefficients for cohomology of "large" categories.- T. Kandelaki: K-theory of Z2-graded Banach categories.- D. Pataraia: On Quillen's plus construction of perfect groups.- T. Pirashvili: Cohomology of small categories in homotopical algebra.- M. Uridia: U-theory of exact categories.