Question

Could the specification limit be = (equal) to the control limit? Yes_________: No____________ (Describe the condition quality outcome of the factory when this is true)

if No why?

Answer 1

The specification limits can be equal to the control limits.

In that case, the process capability ratio is equal to 1 ie. the six sigma band is the desirable quality outcome for the product characteristic in consideration.

Generally , in a practical scenario, this is not true since the specification limits are desired to be more than the control limits since it gives the process some room for error before the process goes completely out of control.

Quality during the situation where specification limit= control limit is supposed to be a desirable one when the process remains in statistical control.