The Squawk Point

Organisational Mechanics

  • Home
  • Blog
    • People
    • Data
    • Process
    • Wild Cards
    • Index
  • Podcast
  • Book

Process Noise and Coffee Sticks

8 October, 2011 by James Lawther 6 Comments

I would like you to do something for me, next time you are in Starbucks go and steal twenty of those sticks that they have for stirring coffee.  Go on I dare you, be a little dangerous.

Next I want you to snap them all in half using your two bare hands.

Finally I want you to line up all the sticks that were in your left hand in a nice neat row.

With luck it will look a little bit like this:

Statistical Process Control

No, I haven’t lost my marbles.

Now, imagine it was a KPI chart of wait times, or quality performance.  It would look a bit like this.

Statistical Process Control

So what is the point?

If you were trying to explain this to your boss what would you say?

  • Oh we had a problem with logging onto the system
  • There was a definite performance improvement here
  • This is where the training went live
  • We have shown a consistent improvement since June

The truth of the matter is that nothing changed at all.  “Stuff” just happens.  We rationalise away movement, we try to explain it, but in truth, nothing actually changed, it was just random noise.

In the same way that the length of the sticks varies when you break them so all systems vary.

And that is what process noise is, random variations that just happen, it might look like something has changed in the system, but in reality it hasn’t.

Why do you need to know?

If you are trying to improve something it is a good idea to look at the trend of performance, so that you can see if you are having an impact or not.

If you are, do more of it.  If you are not, try something else.

If your coffee stirrers looked like this when would you start to take note?  Can you tell when you really made a difference?

Statistical Process Control

Read another opinion

Image by marcopako

Filed Under: Blog, Operations Analysis, Tools & Techniques Tagged With: key performance indicators, process control, process noise, six sigma, statistical process control

About the Author

James Lawther
James Lawther

James Lawther is a middle-aged, middle manager.

To reach this highly elevated position he has worked in numerous industries, from supermarket retailing to tax collecting.  He has had several operational roles, including running the night shift in a frozen pea packing factory and carrying out operational research for a credit card company.

As you can see from his C.V. he has either a wealth of experience or is incapable of holding down a job.  If the latter is true this post isn’t worth a minute of your attention.

Unfortunately, the only way to find out is to read it and decide for yourself.

www.squawkpoint.com/

Comments

  1. maz iqbal says

    9 October, 2011 at 9:48 am

    Hello James
    I love the way that you turned a concept (that only statiticians really get) into a concrete example that my ten year old can understand.

    Maz

    Reply
    • James Lawther says

      9 October, 2011 at 6:35 pm

      Thank you Maz. Unfortunately I can’t go back into that branch of Starbucks, I have been banned.

      Reply
  2. Adrian Swinscoe says

    11 October, 2011 at 7:36 am

    Hi James,
    That’s brilliant. When you took the stirrers did you:
    a. Brazenly grab a bunch and walk out head held high
    b. Furtively place the bunch in your trouser pocket and tip toe out; or
    c. Did you have an accomplice that drove you to the store…..your ran into the store, in your full-face balaclava, stood in line, ordered 2 frappacinos (one for each of you), paid, received some loyatly points, thought about buying some specilaity coffee and decided against it, then grabbed then sticks and ran out the door and shouted ‘go go go!’ to your get away driver

    I’d be intrigues to know which option you chose?

    Adrian

    Reply
    • James Lawther says

      12 October, 2011 at 4:44 am

      Option B

      Reply
  3. Guy Letts says

    11 October, 2011 at 12:59 pm

    James

    Great illustration. Another key point is buried within your post ~ ‘How would you explain this to your boss?’

    So much that is done in the name of customer service is actually driven by internal company culture and politics.

    We experience this quite often when people see our lightning-fast, customer-friendly, action-oriented satisfaction survey tools. “Oh, but our current survey is this [incredibly long] one and we need to know this [and this and this and this…].”

    At that point we always know that their surveys are dreaded rather than welcomed by customers, that response rates are low, those that do come in are never acted on…and that we’re unlikely to make a sale.

    How hard it is for us all to think like customers when we’re doing our jobs!

    Reply
    • James Lawther says

      12 October, 2011 at 4:46 am

      I couldn’t agree more Guy, at best we suffer from confused motivations

      Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Explore

accountability assumptions beliefs best practice blame bureaucracy capability clarity command and control communication complexity continuous improvement cost saving culture customer focus data is not information decisions employee performance measures empowerment error proofing fessing up gemba human nature incentives information technology innovation key performance indicators learning management style measurement motivation performance management poor service process control purpose reinforcing behaviour service design silo management systems thinking targets teamwork test and learn trust video waste

Receive Posts by e-Mail

Get the next post delivered straight to your inbox

Creative Commons

This information from The Squawk Point is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
Creative Commons Licence
Customer Experience Update

Try This:

  • Regression to The Mean

  • Glory Lasts Forever

  • Fish Bone Diagrams – Helpful or Not?

  • Brilliance Alone Won’t Take You Far

Connect

  • E-mail
  • LinkedIn
  • RSS
  • YouTube
  • Cookies
  • Contact Me

Copyright © 2025 · Enterprise Pro on Genesis Framework · WordPress · Log in