Quality Control & Process Improvement Flashcards

An operator notices that hydraulic cycle times become erratic only during the afternoon shift. Which quality tool is best suited to isolate the time-of-day pattern?

Answer: Run chart with data points plotted in time order across both shifts

A run chart preserves the time-sequence of data, making shift-specific patterns visible that would be hidden in aggregate statistics.

Why is it important to document 'near-miss' incidents during mini excavator operations as part of a quality program?

Answer: They reveal process weaknesses before a real failure occurs, enabling proactive improvement

Near-miss data is a leading indicator of future accidents and process failures, allowing corrective action before harm or damage occurs.

A site supervisor uses a check sheet to tally the type of excavation defect found each day for 30 days. The NEXT logical step is to create a:

Answer: Pareto chart to identify which defect types occur most frequently

After collecting frequency data with a check sheet, a Pareto chart ranks defect types by occurrence, directing attention to the most impactful problems first.

What does 'cycle time reduction' mean in the context of mini excavator quality improvement?

Answer: Decreasing the time needed to complete one full dig-swing-dump-return sequence without sacrificing quality

Cycle time reduction aims to complete each productive dig cycle faster through technique, setup, or equipment improvements while maintaining output quality.

An improvement team determines that 40% of rework on a grading project is caused by operators not receiving updated grade stakes in time. This is an example of:

Answer: A process handoff failure — an upstream communication gap causing downstream quality problems

When rework is caused by late or missing information from a preceding step, it is a handoff or interface failure between process steps, not an operator skill issue.

Which of the following best represents a 'leading indicator' of quality in mini excavator operations, as opposed to a 'lagging indicator'?

Answer: Percentage of pre-shift inspections completed on time this week

Leading indicators measure behaviors and conditions that predict future quality outcomes, while lagging indicators report what already went wrong.

After implementing a new bucket-teeth replacement schedule, management wants to confirm the change is 'holding' three months later. The best quality tool for this verification is:

Answer: A control chart monitoring bucket penetration performance over the three-month period

A control chart tracks ongoing process performance over time and will reveal whether the improvement is sustained or if the process is drifting back toward its previous state.