Lean Six Sigma Yellow Belt Certification The Control Phase 3

Question 1

What is a 'response plan' in the context of a control chart?

Accepted Answer

A predetermined set of actions to take when the process goes out of control

Answer

A response plan specifies exactly what actions operators should take when a control chart signals an out-of-control condition.

Question 2

Which of the following is a visual management tool commonly used to sustain Control phase improvements?

Accepted Answer

5S workplace organization

Answer

5S (Sort, Set in Order, Shine, Standardize, Sustain) creates visual workplace organization that makes abnormalities immediately obvious.

Question 3

In statistical process control (SPC), control limits are typically set at:

Accepted Answer

±3 standard deviations from the mean

Answer

Control limits are set at ±3 standard deviations (sigma) from the process mean, capturing 99.73% of natural variation.

Question 4

What is 'process entrenchment' and why is it a risk in the Control phase?

Accepted Answer

The gradual reversion to old work habits that erodes improvements

Answer

Process entrenchment refers to employees reverting to old habits over time, which is why standardization and monitoring are critical.

Question 5

A Cpk value of 1.33 generally indicates that a process is:

Accepted Answer

Capable and meeting industry minimum requirements

Answer

A Cpk of 1.33 is the widely accepted minimum threshold for a capable process, corresponding to approximately 64 DPMO.

Lean Six Sigma Yellow Belt Certification Practice Test