“Red / Amber / Green” Charts Are Neither State of the Art Nor Effective Visual Management


In my book Measures of Success: React Less, Lead Better, Improve More, I try to make the case that “Process Behavior Charts” are a better technology than tables of color coded numbers.

These tables of numbers are often referred to as “bowling charts.” They are often taught as a method in Lean classes or workshops. But, they are problematic.

Here is an example of such a chart / table from my book:

Can you really make good decisions based on this? We might be able to react… that number is red, grrr…. OK, now what? Does a metric going from green to red (or vice versa) mean that there has been a meaningful change in the system? Not always.

Again, Process Behavior Charts are better, they are more helpful. #PlotTheDots, as they say.

I saw this presented yesterday in a Lean workshop as an example of what they called “visual management.” Well, it is visual:

This showed just a single snapshot in time, which is even worse / less helpful. A single data point, compared to a target, can be very misleading. If you go demand a “root cause” for each of the reds… that might very well end up being wasted motion.

It's visual — but does it help you manage effectively? Again, a Process Behavior Chart helps us react less, lead better, and improve more.

I was taught that “visual management” was about “knowing the difference between normal and abnormal, right now!” I'll credit Fujio Cho for that, but others at Toyota have said and taught the same thing. Visual management is meant to be real time — metrics are often slow and lagging.

Here is some recent LinkedIn discussion about this:

On a positive note, I'm very thankful that Samantha Riley and others NHS England are teaching Process Behavior Charts (a.k.a. XmR Charts). Check out their free publication called “Making Data Count.” It's fab.

They did an online class today and they, like I do, frame the “Red Amber Green” (or “RAG”) tables as a problem. It's not a “best practice.” It's not “state of the art.”

They shared an example of what they are helping hospitals and their Boards shift away from:

Yes, we need to do better!

You could frame the problem as “too many metrics.” That's worth discussing. But boiling it down to just six metrics, visualized the same way, is still going to be problematic.

Here is an example that they shared of an XmR Chart:

That metric went from “green” to “red” (it's now worse than target). But, if you look at the left hand side of the chart (the blue and the grey data points), that's just fluctuating… some data points were better than target and some were worse than target. But that was just “common cause” variation. The orange data points show a downward shift… the system has gotten worse. We don't know that because the data is “in the red,” we know it because we can see it visually (see it better) in the PBC.

Performance has gotten worse. THIS is a time to ask why, to look for a root cause, and to try to improve the system.

I've written and shared a lot about how PBCs are better, so I won't keep re-writing that post. I'll share a link:

Making it “visual” doesn't mean that it's helpful. Reacting to a single data point might be “data-driven decision making” but that doesn't mean that's good decision making.

Process Behavior Charts are a solution to a problem (RAG charts, bowling charts) that most leaders don't see as a problem. That's the rub. If we can't get agreement on a problem statement, we won't even be able to talk about possible countermeasures…

What do you think? What do you see being taught in the guise of “visual management?”


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Mark Graban is an internationally-recognized consultant, author, and professional speaker who has worked in healthcare, manufacturing, and startups. His latest book is Measures of Success: React Less, Lead Better, Improve More. He is author of the Shingo Award-winning books Lean Hospitals and Healthcare Kaizen, as well as The Executive Guide to Healthcare Kaizen. He also published the anthology Practicing Lean that benefits the Louise H. Batz Patient Safety Foundation, where Mark is a board member. Mark is also a Senior Advisor to the technology company KaiNexus.

  1. Mark Graban says

    Lots of discussion about this on LinkedIn:

  2. Nick Longman says

    ‘I was taught that visual management meant, “Knowing the difference between normal and abnormal, RIGHT NOW.”‘

    Hi Mark. I really love this statement. Metrics lag behind and if you rely solely on metrics… do you really know your area? Prime example- I took a tour of an Amazon warehouse over the summer. While walking amongst the perceived chaos, my guide clearly saw something out of the ordinary. He immediately started pulling the levers at his disposal, first talking to the process assistant to investigate and then reallocating associates to help solve the problem. He never looked at a computer, he knew something was wrong because he went where the work was being done (bringing back to GEMBA, something Amazon’s FC leadership does daily). Always enjoy seeing articles and posts like this that help you think harder about something right in front of your face. Thanks for sharing, Nick.

  3. Mark Graban says

    Hi Nick – Thanks for reading and thanks for commenting. Great point about not relying completely on metrics, especially when they are slow and lagging. As you describe, we need to see problems with our eyes in real time…

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