Earlier when we talked about achievements of Dr. Juran one of the items in that was Juran trilogy this 2
is what Juran suggested 3
let's understand that. Quality is achieved in three main stages. 4
The first one is quality planning. 5
So whatever product or service that you are making the first thing that you need to do is you do quality 6
planning. 7
How do you plan to achieve quality and based on that you achieve a certain level of quality. 8
So here if you look at this diagram on the bottom right here I have the picture given by Dr. Juran how 9
he demonstrated the trilogy, how he demonstrated the achievement of quality. 10
This is the quality planning part, based on this quality planning 11
you do quality control. 12
So you start making the product or you start providing the service and you achieve a some level of quality 13
here. 14
So this is what is demonstrated as quality control where you achieve quality within certain boundaries. 15
You really cannot achieve a certain number. 16
Sometimes your numbers will go up. 17
Sometimes your numbers will go down. 18
This is because of natural fluctuation. 19
So if you have a repair rate mentioned here for example then some day you will have a slightly higher repair rate, 20
some day slightly lower rate but then you'll still have a band within which your production is working 21
because you have quality control in place. 22
So this is stage number two which is quality control which means meeting goals during operation. 23
But then what happens is at certain stage you go through quality improvement processes. 24
You make a breakthrough improvement. 25
Once you do that break through improvement your level of quality improves in a single step and that's what 26
is shown here. 27
So the level of quality improve means your defect level goes down and that's what is demonstrated 28
here by a downturn here that here the quality gets improved. 29
And then once you improve the quality and then you have a new level of quality control, so the quality 30
control band that you had here earlier now your quality control band is here at the bottom at a 31
lower an ejection rate. Based on whatever quality improvement you're doing you'll learn something. 32
And this is what the feedback cycle is that you learn something and you feed it back to your planning 33
portion. 34
So you again plan, you again do the quality control, you again make some improvement. 35
And this cycle of improvement continues. 36
And here if you see here that even though your control but there might be some cases where you might 37
have a spike. Once in a while you might have some fluctuation, some uncontrolled thing something might 38
happen and that might give this sort of a spike but then generally you control within these quality 39
control limits. 40
This is the way to achieve quality as a Quality Trilogy. 41
So anyway if you want to achieve quality you've planned for that you control that and then you make 42
breakthrough improvements learn from that. 43
And then again plan so this cycle of improvement continues. 44
So this was another item which I want to discuss here which is Juran Trilogy. 45
So with this we complete our discussion about Dr. Juran.