There are many possible causes of the variance in the output of the system


		Slide 29 of 54

But there could be many possible causes of the output variance.

Exactly. Traditionally, the only way to identify some of these possibilities would be to use guesswork or brainstorming.

We now have a structured way of identifying virtually all other possibilities that could cause the problem.

In other words, we have a simple process to analyse complex problems.

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