Makefiles have this issue too, sometimes things have been incorrectly made, and the dependencies in the makefile are wrong. Unless it takes more than a few sec

Makefiles have this issue too, sometimes things have been incorrectly made, and the dependencies in the makefile are wrong. Unless it takes more than a few seconds to run a notebook, rerun every cell up to the point you're editing, always. And then if it does take minutes, and you find yourself in an unexplainable rut, then run the entire notebook, and get a cup of coffee.