Manager - People who take the management decision - allocate the money, greenlights, process, reliability, doesn’t know all the technical details.
Engineer - figure out the accuracy of density meters for example, knows all the technical details, installation details, - can I install this on my pipe? Is present for installation/validation.
Day to Day User (Operator) - looks at the values and takes a decision based on those values. Operator is supervised by Engineer.
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