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Abstract. This paper presents the analysis and key findings of a survey aboutdealing with non-functional requirements (NFRs) among architects. We find that,as long as the architect is aware of the importance of NFRs, they do not adverselyaffect project success, with one exception: highly business critical modifiabilitytends to be detrimental to project success, even when the architect is aware of it.IT projects where modifiability is perceived to have low business criticality leadto consistently high customer satisfaction. Our conclusion is that modifiabilitydeserves more attention than it is getting now, especially because in general itis quantified and verified considerably less than other NFRs. Furthermore, ITprojects that applied NFR verification techniques relatively early in developmentwere more successful on average than IT projects that did not apply verificationtechniques (or applied it relatively late in development).Keywords: Software Architecture, Requirements Management, Software ProjectManagement, NFR, Modifiability, Empirical Software Engineering.
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