Contents:L. Badescu: Sur certaines singularités des variétés algébriques -- D.A. Buchsbaum: Homological and commutative algebra -- S. Greco: Anelli Henseliani -- C. Lair: Morphismes et structures algébriques -- B.A. Mitchell: Introduction to category theory and homological algebra -- R. Rivet: Anneaux de séries formelles et anneaux henseliens -- P. Salmon: Applicazioni della K-teoria all'algebra commutativa -- M. Tierney: Axiomatic sheaf theory: some constructions and applications -- C.B. Winters: An elementary lecture on algebraic spaces.