Quality Planning and Control

Question 1

Steps of Quality Planning and Control

Answer 1

Step 1: Define the quality characteristics
Step 2: Decide how to measure each quality characteristic
Step 3: Set quality standards for each quality characteristic
Step 4: Control quality against those standards
Step 5: Find and correct causes of poor quality
Step 6: Continue to make improvements

Question 2

In Quality Planning and Control, in step 1: Define the quality characteristics, what do we ask?

Answer 2

What to measure?

Question 3

In Quality Planning and Control, in step 2: Decide how to measure each quality characteristic, what do we ask?

Answer 3

Variables or attributes?

Atributes (defective or not defective)
Variables (measured on a continuous scale)

Question 4

In Quality Planning and Control, in step 3: Set quality standards for each quality characteristic, what do we ask?

Answer 4

What are acceptable limits on this measure?

Question 5

In Quality Planning and Control, in step 4: Control quality against those standards, what do we ask?

Answer 5

Conformity or nonconformity?

Question 6

What are the two types of errors when you use sampling?

Answer 6

Type I error (𝛼): False Alarm
The sample indicates the process is “out of control” but is not

Type II error (𝛽): Failure to detect
The sample indicates the process is stable, but it really is “out of control”

Question 7

Differences between control limits and specification limits:

Answer 7

Control Limits

• Voice of the process
• Calculated from data
• Appear on control charts
• Apply to subgroups
• Guide for process actions
• What the process is doing

Specification Limits

• Voice of the customer
• Defined by the customer
• Appear on histograms
• Apply to items
• Separate good items from bad
• What we want the process to do