Variables

Question 1

Within-piece variation

Answer 1

Variation in single part

Question 2

Piece to piece variation

Answer 2

Variation among parts produced at same time (ex. Same operator or same shift)

Question 3

Time to time variation

Answer 3

Variation among products produces at different times

Question 4

Sources of variation

Answer 4

Equipment 
Material
Environment 
Operator
Methods
Machines
Tools

Question 5

Chances causes

Answer 5

Are random and present normal distribution

Question 6

Assignable/special causes

Answer 6

Are not random

And the distribution tends to not be normal

Question 7

Before variability can be controlled

Answer 7

Must be able to measure the variation