Get. The. Shot.
There are three words that should drive everything in Production: “Get the shot.” The only two types of activities on set are activities that help get the shot and activities that are preventing the shot. Keep the former going, and minimize the latter. Food belongs to the former category, by the way.
I think sometimes the problems I’ve seen and heard of on set are when people forget that the entire purpose everyone is there is to get the shot.
It’s like a mission statement, but less fluffy!