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Structuring functional requirements of control systems to facilitate refinement-based formalisation

Structuring functional requirements of control systems to facilitate refinement-based formalisation
Structuring functional requirements of control systems to facilitate refinement-based formalisation
Good requirements structure can greatly facilitate the construction of formal models of systems. This paper describes an approach to requirements structuring for control systems that aims to facilitate refinement-based formalisation. In addition to the well-known monitored and controlled phenomena used to analyse control systems, we also identify commanded phenomenon reflecting the special role that an operator plays in system control. These system phenomena guide the structure of the requirements analysis and documentation as well as the structure of the formal models.

We model systems using the Event-B formalism, making use of refinement to support layering of requirements. The structuring provided by the system phenomena and by the refinement layers supports clear traceability and validation between requirements and formal models. As a worked example, we structured the requirements of an automotive lane departure warning system using this approach. We found missing requirements through this process and we evolved the requirement document through domain experts’ feedback and formal modelling.
1863-2122
Yeganefard, Sanaz
434810e4-48eb-4320-a37f-533cf71f6103
Butler, Michael
54b9c2c7-2574-438e-9a36-6842a3d53ed0
Yeganefard, Sanaz
434810e4-48eb-4320-a37f-533cf71f6103
Butler, Michael
54b9c2c7-2574-438e-9a36-6842a3d53ed0

Yeganefard, Sanaz and Butler, Michael (2011) Structuring functional requirements of control systems to facilitate refinement-based formalisation [in special issue: Automated Verification of Critical Systems 2011] Electronic Communications of the EASST, 46

Record type: Article

Abstract

Good requirements structure can greatly facilitate the construction of formal models of systems. This paper describes an approach to requirements structuring for control systems that aims to facilitate refinement-based formalisation. In addition to the well-known monitored and controlled phenomena used to analyse control systems, we also identify commanded phenomenon reflecting the special role that an operator plays in system control. These system phenomena guide the structure of the requirements analysis and documentation as well as the structure of the formal models.

We model systems using the Event-B formalism, making use of refinement to support layering of requirements. The structuring provided by the system phenomena and by the refinement layers supports clear traceability and validation between requirements and formal models. As a worked example, we structured the requirements of an automotive lane departure warning system using this approach. We found missing requirements through this process and we evolved the requirement document through domain experts’ feedback and formal modelling.

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More information

Published date: September 2011
Additional Information: Proceedings of the 11th International Workshop on Automated Verification of Critical Systems (AVoCS 2011)
Venue - Dates: Proceedings of the 11th International Workshop on Automated Verification of Critical Systems (AVoCS 2011), 2011-09-01
Organisations: Electronic & Software Systems

Identifiers

Local EPrints ID: 337259
URI: http://eprints.soton.ac.uk/id/eprint/337259
ISSN: 1863-2122
PURE UUID: 55113c7b-d8df-4f75-9a18-0dbb57987d27
ORCID for Michael Butler: ORCID iD orcid.org/0000-0003-4642-5373

Catalogue record

Date deposited: 20 Apr 2012 11:30
Last modified: 18 Jul 2017 06:04

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Contributors

Author: Sanaz Yeganefard
Author: Michael Butler ORCID iD

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