Root Cause Analysis Flashcards
7 cards from real Lean Six Sigma Yellow Belt Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Root Cause Analysis flashcards as text
In a fishbone diagram, which category would 'outdated software version' fall under?
Answer: Machine
Software or equipment issues are classified under the 'Machine' (or Equipment) category in a fishbone diagram.
Which of the following best describes a 'contributing cause' in root cause analysis?
Answer: A factor that increased the likelihood of the root cause occurring
A contributing cause is a factor that made the root cause more likely to occur but is not the root cause itself.
A team uses the 5 Whys and reaches a conclusion that cannot be further questioned. This ending point is called the:
Answer: Root cause
The root cause is the deepest identifiable cause in a causal chain that, when corrected, prevents recurrence.
Which tool is MOST effective for visually displaying the relationship between a problem and all its potential causes?
Answer: Ishikawa diagram
The Ishikawa (fishbone) diagram visually maps a problem to its potential causes across multiple categories.
During root cause analysis, a team discovers the defect rate increases every Monday morning. What type of cause is this likely indicating?
Answer: Special cause
A recurring pattern tied to a specific condition (Monday mornings) is a special cause of variation, not random noise.
A process produces defects mainly due to operator fatigue during the night shift. In a fishbone diagram, this belongs under which bone?
Answer: Man (People)
Human factors such as fatigue, training, or behavior are categorized under the 'Man' or 'People' bone of the fishbone diagram.
What is the primary purpose of verifying the root cause before implementing a solution?
Answer: To ensure the fix addresses the actual source of the problem
Verifying the root cause ensures resources are not wasted on solutions that address symptoms rather than the true cause.