On the Use of Testability Measures for Dependability Assessment
IEEE Transactions on Software Engineering
Architecture-based approach to reliability assessment of software systems
Performance Evaluation
Probability and statistics with reliability, queuing and computer science applications
Probability and statistics with reliability, queuing and computer science applications
Software Testability: The New Verification
IEEE Software
Error Propagation In Software Architectures
METRICS '04 Proceedings of the Software Metrics, 10th International Symposium
An analytical approach to architecture-based software performance and reliability prediction
Performance Evaluation
Driving the selection of cots components on the basis of system requirements
Proceedings of the twenty-second IEEE/ACM international conference on Automated software engineering
An optimization framework for "build-or-buy" decisions in software architecture
Computers and Operations Research
Path-based error propagation analysis in composition of software services
SC'07 Proceedings of the 6th international conference on Software composition
Automated selection of software components based on cost/reliability tradeoff
EWSA'06 Proceedings of the Third European conference on Software Architecture
Using goals and quality models to support the matching analysis during COTS selection
ICCBSS'05 Proceedings of the 4th international conference on COTS-Based Software Systems
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The domain of our work is focused on the study of the quality attributes of component-based systems and service-based systems. The qualities of a component-based system depend on those ones of the single components. The objective of our work is to support the selection of (COTS and in-house) components under the satisfaction of the quality attributes. First, we have introduced an optimization model, that supports the component selection activity. The selection criterion is based on cost minimization of the whole system subject to constraints on reliability and delivery time of the whole system. In addition, for each in-house developed component it suggests the amount of testing to perform in order to achieve the required level of reliability. In order to automatize the selection activity we have introduced CODER (Cost Optimization under DElivery and Reliability constraints), a framework that allows to annotate UML diagrams with cost, reliability and delivery time information and that automatically generates and solves the optimization model. In order to improve the formulation of our model we are working on the reliability expression. We express the reliability of the whole system as function of the reliability of the single components by assuming independence among components. We have relaxed this assumption and we have introduced a path-based reliability model for a Service-Oriented Architecture (SOA) that embeds the "error propagation" property. Currently, we are working to introduce a framework that automatizes the process of selection of (COTS and in-house) components in all the phases of a component-based development process. In particular, we have introduced a framework that supports the selection of COTS components in the requirements phase. The framework lays on a tool that builds and solves an optimization model, whose solution provides the optimal COTS component selection. The selection criterion is based on cost minimization of the whole system while assuring a certain degree of satisfaction of the system requirements.