Definition EVOP - Evolutionary Operation of Processes

EVOP - (Evolutionary Operation of Processes) - Your Situation

  • Have heard of EVOP but don't use it. No interest.

    Votes: 0 0.0%
  • Have heard of EVOP but don't use it. No time.

    Votes: 0 0.0%
  • We embrace EVOP - Not sure if it works - No reliable data.

    Votes: 0 0.0%

  • Total voters
    11
B

Bill Ryan - 2007

#11
I voted that we embrace it and have reliable data...., but only because EVOP is pretty much our process for Design of Experiments (DOE). We, typically, don't do DOEs, per se. Our process engineers seem comfortable tweaking only a couple of parameters at a time, and feeling they have the issue or improvement taken care of :nope:

Bill
 
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#12
My EVOP story

My first co-op job way back in the early 80’s was at a mine. I had an entry level job tending an on stream process analyzer. I had no idea what the thing did, so after a few weeks I followed the wires up to a control room.

The guys there said the whole mineral processing plant was run by computer. Teletypes and PDP-11s! My device sent information on the content of Lead and Zinc, and then the computer did EVOP to improve the yield.
They gave me the best description ever of how EVOP works.


If you were blindfolded and placed on the side of a hill, how could you most quickly get to the top? What you would do is plant you left foot (the origin) and step with right foot four times at 90 degrees. One direction would be up (increased yield). Now move your left foot to the new highest point and test with your right foot again. You only need to do this 3 times since you came from the low point. Continue on until you get to the top of the hill.

You are mapping out the hill topology or response surface.

The fun becomes when you apply it to more than one variable. It still works, but can no longer be easily described in words.

They had data that showed that starting Friday night and ending Monday morning the EVOP computer system continually improved things. When the process engineers got to work Monday morning “improving things” yields got worse.

Being a dumb student at the time I only now realize what an incredible thing they had set up.

I saw EVOP again 15 years later at a die cast shop. They ran 0% scrap, had tapped out SPC, (Cpks > 20 on key process parameters) and now had the operators running EVOP to decrease cycle times.

A very cool tool, one I hope to use some day.
 

Wes Bucey

Quite Involved in Discussions
#13
So here it is 7 years later and my first exposure to this poll and I STILL have "never heard" of EVOP, despite the fact I once held QS 9000 status for my organization. The point being there are some terms and phrases, which once heard, keep passing through until they come out the other ear and then are never heard of again, mercifully and rightfully forgotten, regardless whether folks performed some process similar to the one described.

It must have been the fact that the phrase was so "contrived" that it just didn't stick. Perhaps if they had used the term "continual improvement" - it might have had better "stickiness."

:topic: The allusion to "string of pearls" brought a smirk - my memory having to do with one of the ways a string of pearls was purported to be used in bawdy houses in my youth.
 
R

Rob Nix

#14
My comment would be the same as post #10. I haven't used it since, but I always look for opportunities to use the right tool (in my present business it just isn't that useful).

But I did like the technique: EVOP, or Response Surface Methodology (RSM) does have its place, and would probably be used more if it was taught more.
 

Tim Folkerts

Super Moderator
#15
If you were blindfolded and placed on the side of a hill, how could you most quickly get to the top? What you would do is plant you left foot (the origin) and step with right foot four times at 90 degrees. One direction would be up (increased yield). Now move your left foot to the new highest point and test with your right foot again. You only need to do this 3 times since you came from the low point. Continue on until you get to the top of the hill.
There are several other variations on this theme that can sometimes be more efficient.

1) Instead of heading in the direction of the single largest increase, head somewhere between the two best steps. For example, if a step to the north took you 4" up and a step east took you 1" up (and S & W took you downhill), then head NNE rather than due N. That is closer to the true uphill direction than either N or E.

2) Instead of stopping after every step and rechecking which way is up, just keep walking forward. After the first step, you may not be heading straight uphill, but you will still be close. Once you reach a point where you start down, then take the four steps NSE & W to determine the uphill direction and head off once again in the new uphill direction. You take more steps actually travelling toward the top, but you take fewer test steps along the way.

One challenge with any such method is if there is a "valley" between you and the top of the highest hill. You will reach the top of the closest hill, but you will get stuck there and never find the highest peak.

Tim F
 
R

RichBubb

#17
Re: EVOP stands for EVolutionary OPerations

>> "Greg House"
>> wrote in message
>> news:3bcc8c5c$0$227$cc9e4d1f...
>>
>> I have heard of most things in QA and CIP, but what is EVOP? <snip>
"Anyone here doing any EVOP experiments?"
Yes, I have used EVOP for process optimization. Setting up the 'recipes' and then determining a suitable rating scale to direct the EVOP's direction when considering that I was attempting to optimize 5 distinct process outputs. Some of the outputs were scaled in a deviation from nominal scenario, and some outputs were a scenario where higher is better was more desireable.

Another process I worked on used a Sequential Simplex Optimization [SSO] method. This had similar outputs as the previously detailed (above) EVOP. I decided to use SSO since the number of variables I was had to adjust five factors per 'recipe-run'. I found that EVOP can handle 2 or 3 factors, but gets unwieldly after that. The 5 factor SSO did remarkably well in helping steer the process to a MUCH better results than the OFAT [One Factor At a Time] method that had been the previously used.
 
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