The present volume is the third in a series of VDM Symposia Proceedings. The Methodology group has been further subdivided into five areas: Specification Methodology, Design Methodology, Modularity, Object Orientedness, and Processes, Concurrency and Distributed Systems.

Object orientation and formal techniques.- An algebraic approach to refinement.- Modal logic programming.- Z specification of an object manager.- Correctness in the small.- A formal approach to hypertext using post-prototype formal specification.- Programming with VDM domains.- A buffering system implementation using VDM.- Formal specifications as reusable frameworks.- Z and the refinement calculus.- Modularizing the formal description of a database system.- Modular extensions to Z.- Adding abstract datatypes to Meta-IV.- Towards a semantics for object-Z.- HOOD and Z for the development of complex software systems.- Using Z as a specification calculus for object-oriented systems.- Specifying open distributed systems with Z.- Refinement of state-based concurrent systems.- Refining data to processes.- Two approaches towards the formalisation of VDM.- Type checking BSI/VDM-SL.- Type inference in Z.- Recursive definitions revisited.- Towards the semantics of the definitional language of MetaSoft.- On conservative extensions of syntax in the process of system development.- A formal semantics for Z and the link between Z and the relational algebra.- A naive domain universe for VDM.