Most manufacturers have been using the wrong methods for years and it shows in the (lack of) results. Brainstorming is divergent. It yields many candidates that need to be confirmed or refuted.  Investigative problem solving is convergent, it finds its way to root cause.

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Problem solvers need good software for statistical analyses. It does not get better than R and RStudio. Both are open-source and free for you to use. This course will get you started quickly. 

This is a quick course that shows you how to get your data into R and generate charts and graphs from that data.