Cal Newport touches on single root commitments and productivity.

The solution to these issues is simple: maintain a single root commitment, that you’ll stick to no matter what, which will in turn help you get the most out of all the other productivity commitments that come and go in your life.

To be more concrete, create a single page document that describes the key productivity rules, habits, and systems (which I’ll summarize as “processes” in the following) that you currently follow in your life.

— On Rooted Productivity by Cal Newport