This is a critical skill in big companies where everyone is swamped and busy and things get lost. I do this all the time when I’m dealing with people who don’t answer their email, or who tend to stall and delay approvals, or people who are just very busy. I’ll Email and describe the problem and then say the magic phrase “ If I don’t hear back from you in [N] days , I am going to do XYZ on [DAY N].” This way I’m not a…
In the military, it gets abbreviated “UNODIR” meaning “Unless otherwise directed”.
And that'd be a useful code to include in the subject line of the email, e.g.:
To: Boss
From: Me
Subj: UNODIR by [DATE], upgrading the production database