Processes have inputs and outputs - both can (and should) be controlled with Process Control techniques, but the methods and their goals are very different from input checks vs output controls.
The main message is that you want to target for set-POINT inputs and output RANGES; so only 1 target for an input, no "free choice within a range" instructions to operators, but outputs should have a predetermined range, as there will always be some variation within process.
An additional tip: your quality system probably calls for a number of PRODUCT specification checks - this is a good thing; it will be even better if for the process producing that product, you also have a PROCESS control limit. That way, you will have an orange 'act on the process, not the product' action level and a red 'act on both process and product' action level - having the orange action level will help you prevent needing to block or rework products. (check out my videos on SPC for more info on that)
#continuousimprovement #processcontrol #spc
• Process Control: check...
00:01 Understanding Process Control
01:11 Controlling Input Variables
03:52 Implementing Set Points
05:54 Managing Output Variation
08:29 Specifying Measurement Tolerances
09:48 Establishing Control Limits