The COSY formalism facilitates the abstraction of synchronizational aspects of concurrent and reactive systems, and their analysis. The COSY theory is developed in detail and proofs of major results are given in full. Applications of COSY to practical problems are given.

Inhalt
1 What COSY Is and What It Is For.- 1.1 Introduction.- 1.2 Concepts, Objectives and Design Decisions.- 1.3 Structure of Bookevevr.- 1.4 Acknowledgements.- 2 Formal Theory of Basic COSY.- 2.1 Basic COSY Syntax and Semantics.- 2.2 VFS Semantics of COSY.- 2.3. Petri Net Semantics of COSY.- 2.4 Adequacy Properties of Path Programs.- 2.5 Execution Semantics for COSY.- 2.6 Semantics of COSY with Priorities.- 2.7 Bibliographic Notes.- 3 High-level COSY Programs and System Design.- 3.1 High-level COSY Syntax and Semantics.- 3.2 The Process Notation.- 3.3 Macro Generators for COSY Notation.- 3.4 The Semantics of Macro COSY Programs.- 3.5 The COSY Environment.- 3.6 The COSY System Dossier.- 3.7 Bibliographical Notes.- 4 COSY Applications.- 4.1 Two-Way Channel with Disconnect.- 4.2 The Hyperfast Banker.- 4.3 Cigarette Smokers.- 4.4 Merlin-Randell Problem of Train Journeys.- 4.5 Transforming Sequential Systems into Concurrent Systems.- 4.6 Modelling N-Modular Redundancy.- 5 Comparison of COSY with Other Models.- 5.1 COSY and CCS.- 5.2 COSY and CSP.- Full COSY and Petri Nets.- 5.4 Vector Sequences and Mazurkiewicz Traces.- 5.5 COSY and Synchronized Behaviours.- 6 Historical Perspective.- 6.1 Introduction.- 6.2 Conceptual and Methodological Framework of COSY Approach.- Appendices.- A Algebra of Relations.- B Automata and Formal Language Theory.- B.1 Strings.- B.2 Languages.- B.3 Regular Expressions and Languages.- B.4 Finite State Automata and Grammars.- C Elements of Graph Theory.- D Proofs of Theorems 2.25, 2.26 and 2.28.- E Proofs of Theorems 2.37 and 2.38.- F Proof of Theorem 2.29.- G Proof of Theorem 4.3.- H Basic COSY Notations and Macro COSY Notation.- List of Figures.- List of Algorithms.- List of Definitions.- List of Theorems.- List of Corollaries.- List of Lemmas.