Geometries and Groups : Proceedings of a Colloquium Held at the Freie Universität Berlin May 1981 The basic diagram of a geometry Linear spaces and steiner systems On designs Some remarks on representation theory in finite geometry Geometry and Loops On possible orders of noncommutative tactical spaces Mathieu groups With designs and Golay codes Extending strongly resolvable designs Some unitals on 28 points and their embeddings in projective planes of order 9 The large with design—Materialized k difference cycles and the construction of cyclic t designs Characterization of biplanes by their automorphism groups Ein Einfacher Beweis für den Satz von Zsigmondy über primitive Primeiler von AN 1 On a class of edge regular graphs Geometries uniquely embeddable in projective spaces Strong point stable designs.