595Appendix V
Process Capability
Process capability calculations indicate the ability of a process to meet speci-
cation limits.
When to use it
• When setting up a process, to ensure it can meet its specication
limits
• When setting specication limits, to ensure they are neither too
wide nor too narrow
• When investigating a process that is not meeting its specication
limits
• When the process is stable and has a Normal distribution
Process Decision Program Chart (PDPC)
The process decision program chart (commonly just referred to as PDPC) is
used to identify potential problems and countermeasures in a plan.
When to use it
• When making plans, to help identify potential risks to their success-
ful completion
• When risks are identied, use i