This volume contains the papers presented at a conference on computer refinement, which is the term used to describe systematic and formal methods of specifying hardware and software. These specifications are then transformed into designs and implementations.

Among the topics discussed in this volume are: the role of refinement in software development, parallel designs and implementations, methods and tools for verifications of critical properties, refinement and confidentiality, concurrent processes as objects, the compliance of Ada programmes with Z specifications and a tactic-driven refinement tool.