I do not know what everyone is complaining about the article was well written and the graphics are fully visible to those that need to see them, or should I say understand them.
As for a D graphic, you are way off, it only takes three at most two if you lead a good session and explain the process correctly and weed out the erroneous and non applicable content as the team brainstorms.
As a great Japanese leader once told me, only follow what you have to lead, not what you lead.
That means learn as you go, do not look back, learn quickly from your mistakes and be master of all.
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