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The number of uml models or the number of document

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the number of UML models, or the number of document pages, or the number of lines of code) Minor errors found, Err minor —the number of errors found that can be categorized as minor (requiring less than some pre-specified effort to correct) Major errors found, Err major — the number of errors found that can be categorized as major (requiring more than some pre-specified effort to correct) CS352 Software Engineering II
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Example I • If past history indicates that the average defect density for a requirements model is 0.6 errors per page, and a new requirement model is 32 pages long, a rough estimate suggests that your software Dr. Omar Hamdy Spring 2011 8 team will find about 19 or 20 errors during the review of the document. You only found 6! Is this good or bad? • you’ve done an extremely good job in developing the requirements model or your review approach was not thorough enough. CS352 Software Engineering II
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Example II The effort required to correct a minor model error (immediately after the review) was found to require 4 person-hours . The effort required for a major requirement error was found to be 18 person-hours . Examining the review data collected, you find that minor errors occur about 6 times more frequently than major errors. Therefore, you can estimate that the average effort to find and correct a requirements error during review is about 6 person-hours. How? Dr. Omar Hamdy Spring 2011 9 Requirements related errors uncovered during testing require an average of 45 person-hours to find and correct. Using the averages noted, we get: Effort saved per error = E testing – E reviews 45 – 6 = 39 person-hours/error Assuming 22 errors were found during the review of the requirements model , a saving of about 660 person-hours of testing effort would be achieved. And that’s just for requirements-related errors CS352 Software Engineering II
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Overall Dr. Omar Hamdy Spring 2011 10 CS352 Software Engineering II
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Informal Review Informal reviews include: – a simple desk check of a software engineering work product with a colleague – a casual meeting (involving more than 2 people) for the purpose of reviewing a work product, or Dr. Omar Hamdy Spring 2011 11 – the review-oriented aspects of pair programming pair programming encourages continuous review as a work product (design or code) is created.
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