'The Checklist Manifesto' by Atul Gawande
All Square employees get a copy of "The Checklist Manifesto" on their first day at work, and Dorsey once tweeted that he's brought stacks of them to give away at Twitter.
In this 2009 book, surgeon and writer Atul Gawande argues that there are mistakes of ignorance and mistakes of ineptitude, and the latter category is most prevalent in the modern world. He believes clearly written guides and checklists are required for completing complex tasks to the best of your ability.
Gawande came to this conclusion when he and his team developed a safe surgery checklist that became a huge success around the world.