Pet peeve of mine: Using “I was waiting for” as an excuse.
Too often somebody who’s not meeting a deadline responds that they’re failing because: “I was waiting for John Doe to do X first.”
Sometimes the precondition is totally legitimate. They really needed John Doe to do X before they could do what they promised me.
But then too often the following exchange happens:
Me: “Why isn’t John Doe doing X.”
Them: “I emailed asking him to do X and I didn’t hear back.”
Me: “Did you pick up the phone and call John to confirm he got the email to make sure it’s getting done?”
Them: “No.”
Me: “When it was clear John wasn’t doing X by the time you needed X done, did you make any further effort beyond email to get X done by them or figure out another path forward?”
Them: “No.”