TLDR: First try and see if there a non-obvious cause, like a disability, a situation with someone else on the team, ect. Then either fire them or re-assign them

TLDR: First try and see if there a non-obvious cause, like a disability, a situation with someone else on the team, ect. Then either fire them or re-assign them to a different role. --- I think it's important to set clear expectations early and explain common sense. Sometimes things that you think are obvious aren't. I also think it's important to be a lot more introspective about your current situation and management style. I've seen "nice but incompetent" happen because a manager didn't set clear expectations at the beginning, and just assumed subordinates would "figure it out."