Limited resources in a way that has the highest

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limited resources in a way that has the highest likelihood of achieving a high quality result CS352 Software Engineering II
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Statistical SQA Information about software errors and defects is collected and categorized. An attempt is made to trace each error and defect to its underlying cause (e.g., non-conformance to specifications, design error, violation of standards, poor communication with the customer) Dr. Omar Hamdy Spring 2011 6 Using the Pareto principle (80 percent of the defects can be traced to 20 percent of all possible causes), isolate the 20 percent (the vital few ). Once the vital few causes have been identified, move to correct the problems that have caused the errors and defects. CS352 Software Engineering II
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Six-Sigma for Software Engineering The term “six sigma” is derived from process capability—3.4 instances (defects) per million occurrences—implying an extremely high quality standard. The Six Sigma methodology defines the following core steps: Define customer requirements and deliverables and project goals via well-defined methods of customer communication Measure the existing process and its output to determine current Dr. Omar Hamdy Spring 2011 7 quality performance (collect defect metrics) Analyze defect metrics and determine the vital few causes Improve the process by eliminating the root causes of defects. Control the process to ensure that future work does not reintroduce the causes of defects CS352 Software Engineering II
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Software Reliability A simple measure of reliability is mean-time- between-failure (MTBF), where MTBF = MTTF + MTTR The acronyms MTTF and MTTR are mean- time-to-failure and mean-time-to-repair , Dr. Omar Hamdy Spring 2011 8 respectively. Software availability is the probability that a program is operating according to requirements at a given point in time and is defined as Availability = [MTTF/(MTTF + MTTR)] x 100% CS352 Software Engineering II
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Software Safety Software safety is a software quality assurance activity that focuses on the identification and assessment of potential hazards that may affect software negatively Dr. Omar Hamdy Spring 2011 9 and cause an entire system to fail. If hazards can be identified early in the software process, software design features can be specified that will either eliminate or control potential hazards.
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