What are Process Capability and Process Stability?

[sxbalasu]

Dear Friends:
With my little knowledge in QA and process controls
Process Stability meaning that your process is under chance cause variation and there is not assignable cause variation.
Process capability is the ability of the process to produce a component withing the specified limits.
Please clarify and post your thoughts
thanks

 

[M Greenaway]

Process stability is the variation of the mean of the process over time (or process drift).

A process performing statistically in control, i.e. a normal distribution is only subject to common cause variation.

Process capability is generally a ratio of process variance to specification tolerance.

 

[Marc]

Also see Evaluating Process Stability - Unstable Processes - Cpk/Ppk?

Any other contemporary comments / replies?