Exam CTAL-TM-001 Topic 1 Question 128 Discussion

Defect density is a testing metric that measures the number of defects identified in a component or system divided by the size of the component or system (expressed in standard measurement terms, e.g., lines-of-code, number of classes or function points)1. Defect density is a product metric, as it evaluates the quality or reliability of a software product2. Therefore, option B is the correct answer. Option A is incorrect because project metrics are metrics that measure the characteristics of the software project, such as cost, schedule, effort, scope, or resources3. Option C is incorrect because process metrics are metrics that measure the characteristics of the software process, such as effectiveness, efficiency, productivity, or maturity. Option D is incorrect because people metrics are metrics that measure the characteristics of the software personnel, such as skills, experience, motivation, or satisfaction. References: 1: Defect Density | ISTQB Glossary 2: Software Testing Metrics: What is, Types & Example 3: [Project Metrics - Software Testing Fundamentals] : [Process Metrics - Software Testing Fundamentals] : [People Metrics - Software Testing Fundamentals]