The conference consissted of three parts: - Advanced Seminar on Foundations of Innovative Software Development - Colloquium on Trees in Algebra and Programming (CAAP '89) - Colloquium on Current Issues in Programming Languages (CCIPL) The TAPSOFT '89 Conference Proceedings are published in two volumes.

Towards a meaning of ‘M’ in VDM.- Algebraic specification and functionals for transformational program and meta program development.- On the use of specification styles in the design of distributed systems.- Specifying Avalon objects in Larch.- A self-applicable partial evaluator for term rewriting systems.- Verifying correctness of logic programs.- Specifying the behavior of graphical objects using Esterel.- A preprocessor based module system for Prolog.- Formulas, processes, and Petri-Nets applied to the specification and verification of a HDLC protocol.- Compilation of lambda-calculus into functional machine code.- Polymorphic subtype inference: Closing the theory-practice gap.- FACILE: A symmetric integration of concurrent and functional programming.- Development of concurrent programs: An example.- Horn clause programs with polymorphic types: Semantics and resolution.- Type checking, universe polymorphism, and typical ambiguity in the calculus of constructions draft.- Is type checking practical for system configuration?.- An introduction to PSFd.- Processes and functions.- Binding time analysis for polymorphically typed higher order languages.- A fine grain parallel implementation of PARLOG.- Specification and verification of TCSP systems by means of partial abstract data types.- LEAP: A language with eval and polymorphism.- The semantics of program slicing and program integration.- Toward formal development of ML programs: Foundations and methodology.