Abstract Architecture.- Foundations of denotational semantics.- Models of programming language concepts.- Formalization of data base models.- Experiments in block-structured GOTO language modeling: — EXITs versus continuations.- An introduction to data algebras.- Time sequences as a tool for describing program behaviour.- The semantics of clear, a specification language.- An example of hierarchical program specification.- Modular program construction using abstractions.- On the structure of application programs.- Abstract objects as abstract data types.- Design and analysis of highly parallel and distributed systems.- On the semantics of fair parallelism.- Dijkstra's predicate transformers and smyth's powerdomains.- Banquet talk.