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Are high-level UML-style component diagrams helpful to non-technical people? How likely would they be to understand something like that and, if so, how interesting/useful is that likely to be for their understanding?

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    Personally, I've never found them useful even on a technical level.
    – Chenmunka
    Jan 26, 2018 at 9:04

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I think basic flow charts would work best here. If they are non-technical, they won't care what shapes or symbols you choose or be able to understand anything more than a general overview of the process. Anything related to UML would not be useful to them.

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UML diagrams are very technical in nature. They have been distilled from informal diagramming techniques such as flow charts and structure charts (neither of which is a UML diagram!) The purpose of a UML diagram is to capture requirements and operations in a precise and unambiguous way, which necessitates user-unfriendly technical terminology. I would surely avoid any pure UML in a non-technical presentation, with an exception perhaps of deployment diagrams - and even those could be diluted to look less technical.

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