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Other stakeholders - especially managers - tend not to understand anything either but may feel the urge to "manage something" once they are there. So they are better off not being there.
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Some things potentially harmful to Scrum to watch out for with this practice:
- Authoritarian type managers/execs/PO's who might "hover" to silently observe the Daily Scrum might be tempted to exert command and control in the after meetings, or require an after meeting every day to exert such control.
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** Having anyone else participate, especially people who might be viewed as authority figures (SM, PO, Managers, etc) carries the risk of completely destroying the self organization of the DT. Giving any of these authority figures even the slightest daylight in the Scrum Guide would probably encourage them to try and participate.
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(This scrum developer's final comment ...
I see it every day.)