Slide 31 of 54

What type of difference?

We may find that failures predominantly occur when a new member of staff is employed to

prepare the pizzas. They may be slower because they have to keep looking up the list of ingredients for different types of pizzas.

This implies that it is the variance of the “Quality” of the skill of the people in the supply system that is a major factor in causing the variance of the delivery time of the output.