a watched pot never boils
A process appears to proceed more slowly if one waits for it rather than engaging in other activities.
adj
Wearing a watch.
Passing the third checkpoint, the third smiling [sic] state policeman, a fellow by the name of R. C. Anderson, raises his big silver-watched wrist and touches the brim of his gray felt Stetson (yes, he does) as one faintly remembers Wendell Corey once doing from high on a Canadian Mountie snow peak overlooking something like a distressed Linda Darnell.
Conrad Scott then grabbed Senator Moss’s watched wrist and thrust it into the air, allowing the crowd to exercise their delirium one last time.
Monitored.
You would certainly think the watched quantum pot would also boil. It turns out, because of the vigilant observations, the transition never occurs; the watched quantum pot never boils.
The upper bound only needs to be updated when one of the watched M variables is assigned to false.