Coming to the second tool in these Seven Basic Quality Tools is Cause and Effect Diagram. This particular 2
tool is known by a few other names as well. 3
One of the name of this particular tool is a Fishbone Diagram, fishbone diagram because the look of 4
this is some type of fish which has a head which has fins, so its called Fishbone diagram. 5
This is also known as Ishikawa Diagram because Ishikawa was the one who proposed this diagram this tool. 6
So this is also known as Ishikawa Diagram. 7
So if you hear the name Ishikawa diagram, Fishbone diagram, Cause and Effect Diagram it all means the 8
same. 9
So what does this do. 10
So this tool basically displays the relationship between cause and effect. 11
So if you have a problem your problem is a effect. 12
If you have a loose cap in the bottles which we talked earlier than loose cap is an effect. 13
And what is the cause of that. 14
We look at a number of causes related to that particular problem, that particular effect and that we 15
draw on in fishbone diagram or a cause and effect diagram. 16
So the head of the fish will be the effect. 17
The problem what whatever problem we are having and in that you will have a number of branches which 18
will be showing that what are the causes of that. 19
So what we do is we do brainstorming. 20
We look at a number of causes. 21
What would have caused that particular problem. 22
So by brainstorming you make a big list of causes and then looking at causes you can decide that which 23
of these could be the real cause. 24
Because in any quality problem your intent is to find out the root cause of the problem. 25
If you find out the root cause, you eliminate that your problem will be gone forever. 26
So that's how we use this tool which is cause and effect diagram. 27
And let's look at this slide. 28
What it says is that why do we need that we need this to identify various causes. 29
We talked about that and this helps a group reaching a common understanding of the problem and we talk 30
about that as well that for finding out the causes. 31
We have a group we do brainstorming. 32
We look at various causes. 33
And with that we come up with the cause and effect diagram or let's call that the Fishbone diagram or 34
Ishikawa diagram. 35
How does this look like. 36
Let's move on to the next slide and see a cause and effect diagram and that cause and effect diagram is 37
that very generic cause and effect diagram for quality problem, any quality problem. 38
Let's look at that on the next slide.