Cs352 software engineering ii quality dimensions

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CS352 Software Engineering II
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Quality Dimensions (David Garvin) Serviceability. Can the software be maintained (changed) or corrected (debugged) in an acceptably short time period. Can support staff acquire all information they need to make changes or correct defects? Aesthetics . Most of us would agree that an Dr. Omar Hamdy Spring 2011 13 aesthetic entity has a certain elegance, a unique flow, and an obvious “presence” that are hard to quantify but evident nonetheless. Perception. In some situations, you have a set of prejudices that will influence your perception of quality. CS352 Software Engineering II
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S/W Quality Dilemma If you produce a software system that has terrible quality, you lose because no one will want to buy it. If on the other hand you spend infinite time, extremely large effort, and huge sums of money to build the absolutely perfect piece of software, then it's going to take so long to complete and it will be so expensive to Dr. Omar Hamdy Spring 2011 14 produce that you'll be out of business anyway. So people in industry try to get to that magical middle ground where the product is good enough not to be rejected right away, such as during evaluation, but also not the object of so much perfectionism and so much work that it would take too long or cost too much to complete CS352 Software Engineering II
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Good Enough S/W • Good enough software delivers high quality functions and features that end- users desire, but at the same time it delivers other more obscure or specialized Dr. Omar Hamdy Spring 2011 15 functions and features that contain known bugs. • Are you with or against that concept? Send me your thoughts. CS352 Software Engineering II
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Cost of Quality Prevention costs include: quality planning formal technical reviews test equipment – Training Internal failure costs include Dr. Omar Hamdy Spring 2011 16 – Rework – Repair External failure costs are complaint resolution product return and replacement help line support and warranty work CS352 Software Engineering II
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Cost The relative costs to find and repair an error or defect increase dramatically as we go from prevention to detection to internal failure to external failure costs Dr. Omar Hamdy Spring 2011 17 CS352 Software Engineering II
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Quality and Risk Throughout the month of November, 2000 at a hospital in Panama, 28 patients received massive overdoses of gamma rays during treatment for a variety of cancers. In the months that followed, five of these patients died from radiation Dr. Omar Hamdy Spring 2011 18 poisoning and 15 others developed serious complications. What caused this tragedy? A software package, developed by a U.S. company,
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