Very good and comprehensive article.
Jiri Klouda

After writing the article, several people pointed out to me that there are two additional “questions” added. These were added a bit later to the N&S knowledge by Eli Schragenheim who co-authored the book with Dr. Goldratt. These are put in place to focus the improvement process, and reflect on its effect. Kind of reminding PDCA. The last video link in the article includes an interview with Eli where he explains more about this

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