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Defect Density

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Defect Density is a metric used to measure the number of defects or bugs identified in a product or a component, relative to its size. It can be expressed either as defects per lines of code, defects per function points or defects per user story, depending on the context. A high Defect Density may ā€¦

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Agile Project Management - Defect Density Example Questions

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Question 1

In a software project with two components, 100 defects were found in Component A and 75 defects in Component B. The size of Component A is 50,000 lines of code, and the size of Component B is 25,000 lines of code. Which component has a higher defect density?

Correct Answer: Component B

Defect density is calculated as defects per size. For Component A: 100 defects / 50,000 lines = 0.002, for Component B: 75 defects / 25,000 lines = 0.003. Component B has a higher defect density (0.003) than Component A (0.002).

Question 2

While comparing two Agile teams in your organization, you find that Team A has a higher defect density than Team B. What can you infer from this?

Correct Answer: Team A might have a less effective development or testing process

Higher defect density indicates that there might be issues with the development or testing process of Team A. However, it is important to note that this single metric can't provide a comprehensive view of team performance. To properly compare both teams, you should consider other factors as well.

Question 3

In an Agile project, you noticed a higher defect density during a particular iteration. How would you best address the issue?

Correct Answer: Conduct a root cause analysis and improve the process

In Agile projects, continuous improvement is a goal. Conducting a root cause analysis will help to understand the reasons for the higher defect density. Addressing the root causes and improving the development and/or testing process is the most effective way to reduce defect density in the future.

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