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Trend Analysis and Quality Forecasting
25.1🔒The Fundamental QuestionEvery quality metric, measured over time, answers one question: Is it getting better, worse, or staying the same?
25.2🔒Key Trend Categories
25.3🔒How to Present TrendsAlways include: the data points (at least 6), the direction, the target, and annotations for inflection points.
25.4🔒Defect Arrival CurvesA defect arrival curve tracks the rate at which new bugs are discovered over time during a testing cycle.
25.5🔒Bug Burndown ChartsA bug burndown shows remaining open bugs over time, tracking whether the team is closing bugs fast enough to meet the release date.
25.6🔒Leading vs. Lagging Quality IndicatorsLeading indicators matter more because they warn you before damage occurs. By the time you see a spike in production defects, the damage is…
25.7🔒The Balanced Quality Scorecard
25.8🔒Q&ASelf-Assessment Quiz: Chapter 251. What is the fundamental question every quality trend answers? 2. What shape should a healthy defect arrival curve have? 3. What is the…
25.9🔒Key Takeaways- Every metric tells a story when tracked over time; always present trends with annotations - Defect arrival curves predict release…
25.10🔒Hands-On ExercisesExercise 25.1 (Beginner): Plot the escaped defect rate for your team over the last 6 sprints.
25.11🔒Q&AResume phrasing- Implemented defect arrival curve analysis that predicted release readiness 2 weeks before release date, enabling proactive scope…
25.12🔒Q&ACover letter framingI believe trend analysis tells the story that snapshots cannot. A 5% escape rate is meaningless without context -- is it improving from 12%…
25.13🔒Q&AInterview framing"I approach quality forecasting by tracking both leading and lagging indicators. Lagging indicators like escape rate and customer…
25.14🔒Q&AWhat not to say- "We track escape rate and that tells us everything" -- escape rate is a lagging indicator; by the time it moves, bugs have already…
25.15🔒Q&AQuestion 1Prompt: Your defect arrival curve is flat during a testing cycle instead of converging toward zero. What does this tell you and what do you…
25.16🔒Q&AQuestion 2Prompt: What are three leading indicators you would track for a QA team, and what does each predict? What a strong answer should cover…
25.17🔒Q&AQuestion 3Prompt: How do you use a bug burndown chart to predict whether the team will be ready for a release date? What a strong answer should…