RELAX:a language to address uncertainty in self-adaptive systems requirement


Self-adaptive systems have the capability to autonomously modify their behavior at run-time in response to changes in their environment. Self-adaptation is particularly necessary for applications that must run continuously, even under adverse conditions and changing requirements; sample domains include automotive systems, telecommunications, and environmental monitoring systems. While a few techniques have been developed to support the monitoring and analysis of requirements for adaptive systems, limited attention has been paid to the actual creation and specication of requirements of self-adaptive systems. As a result, self-adaptivity is often constructed in an ad-hoc manner. In order to support the rigorous specication of adaptive systems requirements, this paper introduces RELAX, a new requirements language for self- adaptive systems that explicitly addresses uncertainty inherent in adaptive systems. We present the formal semantics for RELAX in terms of fuzzy logic, thus enabling a rigorous treatment of requirements that include uncertainty. RELAX enables developers to identify uncertainty in the requirements, thereby facilitating the design of systems that are, by denition, more exible and amenable to adaptation in a systematic fashion. We illustrate the use of RELAX on smart home applications, including an adaptive assisted living system.

Publication DOI:
Divisions: College of Engineering & Physical Sciences
?? 50811700Jl ??
Additional Information: The final publication is available at
Uncontrolled Keywords: adaptive systems,requirements engineering,fuzzy logic,smart homes,uncertainty
Publication ISSN: 1432-010X
Last Modified: 15 Apr 2024 07:11
Date Deposited: 27 Jun 2013 13:39
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Related URLs: https://link.sp ... 0766-010-0101-0 (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2010-06
Published Online Date: 2010-03-30
Authors: Whittle, Jon
Sawyer, Pete (ORCID Profile 0000-0001-8044-2738)
Bencomo, Nelly (ORCID Profile 0000-0001-6895-1636)
Cheng, Betty H.C.
Bruel, Jean-Michel



Version: Accepted Version

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