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This volume contains the proceedings of the third International Workshop on Computer Aided Verification, CAV '91, held in Aalborg, Denmark, July 1-4, 1991. The objective of this series of workshops is to bring together researchers and practitioners interested in the development and use of methods, tools and theories for automatic verification of (finite) state systems. The workshop provides a unique opportunity for comparing the numerous verification methods and associated verification tools, and the extent to which they may be utilized in application design. The emphasis is not only on new research results but also on the application of existing results to real verification problems. The papers in the volume areorganized into sections on equivalence checking, model checking, applications, tools for process algebras, the state explosion problem, symbolic model checking, verification and transformation techniques, higher order logic, partial order approaches, hardware verification, timed specification and verification, and automata.

Computer software --- Electronic digital computers --- Logiciels --- Ordinateurs --- Verification --- Congresses --- Evaluation --- Vérification --- Congrès --- -Electronic digital computers --- -681.3*C22 --- 681.3*C3 --- 681.3*F3 --- 681.3*F4 --- Automatic digital computers --- Computers, Electronic digital --- Digital computers, Electronic --- Computers --- Hybrid computers --- Sequential machine theory --- Software, Computer --- Computer systems --- -Congresses --- Network protocols: protocol architecture; protocol verification --- Special-purpose and application-based systems: microprocessor/microcomputer; process control-, real-time, signal processing systems (Computer systems organization)--See also {681.3*J7} --- Logics and meanings of programs (Theory of computation) --- Mathematical logic and formal languages (Theory of computation) --- 681.3*F4 Mathematical logic and formal languages (Theory of computation) --- 681.3*F3 Logics and meanings of programs (Theory of computation) --- 681.3*C3 Special-purpose and application-based systems: microprocessor/microcomputer; process control-, real-time, signal processing systems (Computer systems organization)--See also {681.3*J7} --- 681.3*C22 Network protocols: protocol architecture; protocol verification --- Vérification --- Congrès --- Computer software - Verification - Congresses. --- Electronic digital computers - Evaluation - Congresses. --- Information theory. --- Software engineering. --- Computer network architectures. --- Logic design. --- Computer science. --- Theory of Computation. --- Software Engineering/Programming and Operating Systems. --- Computer System Implementation. --- Logics and Meanings of Programs. --- Mathematical Logic and Formal Languages. --- Special Purpose and Application-Based Systems. --- Informatics --- Science --- Design, Logic --- Design of logic systems --- Digital electronics --- Electronic circuit design --- Logic circuits --- Machine theory --- Switching theory --- Architectures, Computer network --- Network architectures, Computer --- Computer architecture --- Computer software engineering --- Engineering --- Communication theory --- Communication --- Cybernetics --- Congresses. --- -Verification

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Recently, contract-based design has been proposed as an "orthogonal" approach that complements system design methodologies proposed so far to cope with the complexity of system design. Contract-based design provides a rigorous scaffolding for verification, analysis, abstraction/refinement, and even synthesis. A number of results have been obtained in this domain but a unified treatment of the topic that can help put contract-based design in perspective was missing. This monograph intends to provide such a treatment where contracts are precisely defined and characterized so that they can be used in design methodologies with no ambiguity. In particular, this monograph identifies the essence of complex system design using contracts through a mathematical "meta-theory", where all the properties of the methodology are derived from a very abstract and generic notion of contract. We show that the meta-theory provides deep and illuminating links with existing contract and interface theories, as well as guidelines for designing new theories. Our study encompasses contracts for both software and systems, with emphasis on the latter. We illustrate the use of contracts with two examples: requirement engineering for a parking garage management, and the development of contracts for timing and scheduling in the context of the AUTOSAR methodology in use in the automotive sector.

System design.