Join Chris Croft for an in-depth discussion in this video Setting action limits, part of Process Improvement Foundations.
- Okay, in the last section we talked about…the principles of SPC, without using any maths.…In this section, I want to introduce you…to a couple of useful mathematical formulas,…one of which is very simple,…and the other one, which sounds quite horrible,…but is actually easy to work out and very useful.…The easy one first.…The question is, when a machine or a process,…or a department, has performed badly,…how do we know if it's really out of tolerance,…i.e. something really has gone wrong,…or whether they were just unlucky?…For example, suppose the people in my department…are meant to reply to customer enquiries within three days…and I've had a complaint that last week…they were actually replying in five days.…
Is there a problem, or was it just an unlucky week…with some difficult customers and more work than normal?…Of course, if I ask them, they'll say they were just unlucky…so I need a way to measure and track what's really going on.…So let's say I set up a graph of response time,…maybe for each day, and I can see if it's drifting upwards…
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- Recall how to measure processes.
- Discover how to use statistical process control.
- Assess the quality, cost, and time trade-off.
- Analyze methods of reducing cost by reducing waste.
- Identify how to improve delivery time.
- Define the Lean and Six Sigma processes.