When Should a Routine Change Instead of Restart?

A routine can stop fitting even when the goal still matters. But changing it after every interruption can make it hard to learn whether the routine was useful in the first place.

Suppose a weekly learning block keeps getting displaced by real commitments. What would help you decide whether to protect the original time, shrink the routine, or choose a different day altogether?

What signal tells you a routine needs a redesign—not just another restart?