Deep Work: Rules for Focused Success in a Distracted World

by Cal Newport

What I do takes long hours of studying and uninterruptible concentration.

First, distraction remains a destroyer of depth.

When I shifted to tracking deep work hours, suddenly these measures became relevant to my day-to-day: Every hour extra of deep work was immediately reflected in my tally.

my mind has a tendency to rehash simple preliminary results, again and again, to avoid the harder work of building on these results toward the needed solution.

relevant variables are identified, define the specific next-step question you need to answer using these variables.