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Model-Based Trade-off Analysis of Non-Functional Requirements: An Automated UML-Based Approach
Mälardalen University, School of Innovation, Design and Engineering. Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (IS (Embedded Systems))ORCID iD: 0000-0002-1512-0844
Mälardalen University, School of Innovation, Design and Engineering. Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (IS (Embedded Systems))ORCID iD: 0000-0003-0416-1787
Mälardalen University, School of Innovation, Design and Engineering. Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems. (IS (Embedded Systems))ORCID iD: 0000-0001-7586-0409
2013 (English)In: International Journal of Advanced Computer Science IJACSci, ISSN 2251-6379, Vol. 3, no 11, p. 575-588Article in journal (Refereed) Published
Abstract [en]

One common goal followed by software engineers is to deliver a product which satisfies the requirements of different stakeholders. Software requirements are generally categorized into functional and Non-Functional Requirements (NFRs). While NFRs may not be the main focus in developing some applications, there are systems and domains where the satisfaction of NFRs is even critical and one of the main factors which can determine the success or failure of the delivered product, notably in embedded systems. While the satisfaction of functional requirements can be decomposed and determined locally, NFRs are interconnected and have impacts on each other. For this reason, they cannot be considered in isolation and a careful balance and trade-off among them needs to be established. We provide a generic model-based approach to evaluate the satisfaction of NFRs taking into account their mutual impacts and dependencies. By providing indicators regarding the satisfaction level of NFRs in the system, the approach enables to compare different system design models and also identify parts of the system which can be good candidates for modification in order to achieve better satisfaction levels.

Place, publisher, year, edition, pages
2013. Vol. 3, no 11, p. 575-588
Keyword [en]
Non-Functional Requirements, Trade-off analysis, UML, Model-Based Development, Quality attributes, Non-Functional Properties, Extra-Functional Properties.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:mdh:diva-25126ISRN: 2251-6379 OAI: oai:DiVA.org:mdh-25126DiVA, id: diva2:722205
Projects
MBAT - Combined Model-based Analysis and Testing (Artemis/Vinnova)ITS-EASY Post Graduate School for Embedded Software and Systems
Available from: 2014-06-05 Created: 2014-06-05 Last updated: 2015-01-12Bibliographically approved
In thesis
1. Preservation of Extra-Functional Properties in Embedded Systems Development
Open this publication in new window or tab >>Preservation of Extra-Functional Properties in Embedded Systems Development
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The interaction of embedded systems with their environments and their resource limitations make it important to take into account properties such as timing, security, and resource consumption in designing such systems. These so-called Extra-Functional Properties (EFPs) capture and describe the quality and characteristics of a system, and they need to be taken into account from early phases of development and throughout the system's lifecycle. An important challenge in this context is to ensure that the EFPs that are defined at early design phases are actually preserved throughout detailed design phases as well as during the execution of the system on its platform. In this thesis, we provide solutions to help with the preservation of EFPs; targeting both system design phases and system execution on the platform. Starting from requirements, which form the constraints of EFPs, we propose an approach for modeling Non-Functional Requirements (NFRs) and evaluating different design alternatives with respect to the satisfaction of the NFRs. Considering the relationship and trade-off among EFPs, an approach for balancing timing versus security properties is introduced. Our approach enables balancing in two ways: in a static way resulting in a fixed set of components in the design model that are analyzed and thus verified to be balanced with respect to the timing and security properties, and also in a dynamic way during the execution of the system through runtime adaptation. Considering the role of the platform in preservation of EFPs and mitigating possible violations of them, an approach is suggested to enrich the platform with necessary mechanisms to enable monitoring and enforcement of timing properties. In the thesis, we also identify and demonstrate the issues related to accuracy in monitoring EFPs, how accuracy can affect the decisions that are made based on the collected information, and propose a technique to tackle this problem. As another contribution, we also show how runtime monitoring information collected about EFPs can be used to fine-tune design models until a desired set of EFPs are achieved. We have also developed a testing framework which enables automatic generation of test cases in order verify the actual behavior of a system against its desired behavior. On a high level, the contributions of the thesis are thus twofold: proposing methods and techniques to 1) improve maintenance of EFPs within their correct range of values during system design, 2) identify and mitigate possible violations of EFPs at runtime.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2015
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 171
Keyword
Software Engineering, Embedded Systems, Non-Functional Requirements, Extra-Functional Properties, Model-Driven Development, Trade-off analysis
National Category
Computer Systems Embedded Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:mdh:diva-27300 (URN)978-91-7485-182-3 (ISBN)
Public defence
2015-02-24, Gamma, Mälardalens högskola, Västerås, 13:15 (English)
Opponent
Supervisors
Projects
CHESSMBATITS-EASY
Available from: 2015-01-12 Created: 2015-01-12 Last updated: 2015-02-02Bibliographically approved

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http://ijpg.org/index.php/IJACSci/issue/view/35/showToc

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Saadatmand, MehrdadCicchetti, AntonioSjödin, Mikael

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