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To date the authors have developed and applied numerous model-based GUI testing techniques; however, they are unable to provide definitive improvement schemes to real-world GUI test planners, as the data was derived from open source applications, small compared to industrial systems. This paper presents a study of three industrial GUI-based software systems developed at ABB, including data on classified defects detected during late-phase testing and customer usage, test suites, and source code change metrics. The results show that 50% of the defects found through the GUI are categorized as data access and handling, control flow and sequencing, correctness, and processing defects, system crashes exposed defects 12-19% of the time.
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