CPP Quality Control & Process Improvement 2 — Questions and Answers
Question 1: Which statistical tool is most useful for identifying the root cause of recurring equipment failures in a parking facility?
- Pareto chart
- Scatter diagram
- Control chart
- Fishbone diagram (Correct answer)
Correct answer: Fishbone diagram
A fishbone (Ishikawa) diagram systematically maps all potential causes of a problem, making it ideal for root cause analysis of recurring failures.
Question 2: A parking facility tracks the number of customer complaints per month over 12 months. This is an example of monitoring which type of metric?
- Leading indicator
- Lagging indicator (Correct answer)
- Benchmark metric
- Efficiency ratio
Correct answer: Lagging indicator
Customer complaints are a lagging indicator because they reflect outcomes that have already occurred rather than predicting future performance.
Question 3: In the PDCA cycle, what is the primary purpose of the 'Check' phase?
- Implementing the improvement plan
- Defining the problem statement
- Evaluating results against expected outcomes (Correct answer)
- Standardizing the successful process
Correct answer: Evaluating results against expected outcomes
The Check phase involves comparing actual results against the planned objectives to determine if the improvement achieved its goals.
Question 4: Which process improvement methodology focuses specifically on reducing variation and defects to near-zero levels using a five-phase approach?
- Lean Manufacturing
- Six Sigma DMAIC (Correct answer)
- Total Quality Management
- Kaizen
Correct answer: Six Sigma DMAIC
Six Sigma's DMAIC (Define, Measure, Analyze, Improve, Control) methodology targets defect reduction to 3.4 defects per million opportunities.
Question 5: A parking manager wants to reduce transaction processing time at pay stations. Which Lean tool would best help identify and eliminate non-value-added steps?
- Value stream mapping (Correct answer)
- Control chart
- FMEA
- Balanced scorecard
Correct answer: Value stream mapping
Value stream mapping visually displays all steps in a process, allowing teams to identify and eliminate waste or non-value-added activities.
Question 6: What does a process capability index (Cp) value greater than 1.33 indicate in parking operations quality measurement?
- The process is out of control
- The process is capable and meets specifications (Correct answer)
- The process needs immediate redesign
- The sample size is insufficient
Correct answer: The process is capable and meets specifications
A Cp value above 1.33 indicates the process spread fits comfortably within specification limits, signifying a capable process.
Question 7: Which approach best describes 'mistake-proofing' (poka-yoke) as applied in parking facility operations?
- Training staff to memorize procedures
- Designing systems that prevent errors from occurring or immediately detect them (Correct answer)
- Auditing operations monthly for compliance
- Incentivizing employees with bonuses for error-free shifts
Correct answer: Designing systems that prevent errors from occurring or immediately detect them
Poka-yoke involves designing processes or equipment so that errors are physically prevented or immediately flagged before they cause defects.
CPP Quality Control & Process Improvement 2
Which statistical tool is most useful for identifying the root cause of recurring equipment failures in a parking facility?