Data Refinement
Model-Oriented Proof Methods and their Comparison

The goal of this book is to provide a comprehensive and systematic introduction to the important and highly applicable method of data refinement and proving simulation. The authors concentrate in the first part on the general principles needed to prove data refinement correct, and begin with an explanation of the fundamental notions, showing that data refinement proofs reduce to proving simulation. The topics of Hoare Logic and the Refinement Calculus are then introduced and a general theory of simulations is developed and related to them.

Accessibility and comprehension are emphasised in order to guide newcomers to the area.

The book's second part contains a detailed survey of important methods in this area, such as VDM, and the methods due to Abadi & Lamport, Hehner, Lynch and Reynolds, Back's refinement calculus and Z. All these methods are carefully analysed, and shown to be either incomplete, with counterexamples to their application, or to be always applicable whenever data refinement holds.

This is shown by proving, for the first time, that all of them can be described and analysed in terms of two simple notions: forward and backward simulation.

The book is self-contained, going from advanced undergraduate level but taking the reader to the state-of-the-art in methods for proving simulation.

Corrigendum