Process Control

Question 1

Process

Answer 1

Set of actions that transform our input into output

Question 2

Specifications

Answer 2

Defined parameters of the product’s characteristics. Clearly defined parameters are key to making a consistent product.

Question 3

Target

Answer 3

The desired value of the process parameter eg. temperature or percentage moisture

Question 4

Range

Answer 4

All processes have a degree of acceptable variation: upper and lower specification limits (USL, LSL)

Question 5

Run chart/Control chart

Answer 5

A graph used to study process changes over time. Results are plotted over time with the USL & LSL, and target values specified.
-Only constructed once the process is reasonably under control

Question 6

USL, LSL

Answer 6

Upper specification limit, lower specification limits. Set by the operator.

Question 7

UCL, LCL

Answer 7

Upper control limit, lower control limit. Calculated limits based on the standard deviation info from process data. Give limits and expectations.

Question 8

UWL, LWL

Answer 8

Upper warning limit, lower warning limit. Shows when results are trending out of spec.