Engineering involves design.
There is no design in that flowchart.
So, it is a mislabeled process flowchart, or a glorified repairman's creedo. Or, an insult to engineers. (Possibly by ignorant mechanics that are unable to understand true engineering.)
Also, to make that flow chart fail dismally, all you have to do is assign "it" as any sort of fluid. (Other values of "it" also fail the chart.)
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In case you were wondering, yes, this is a day of boredom for me...