The Checklist Manifesto: How to Get Things Right

Today a doctor, an engineer, or a pilot rarely fails for lack of knowledge. The knowledge exists, published and tested. The problem is different: applying correctly, every single time, a number of steps that has grown so much that no human memory can handle it alone. A complicated childbirth can require dozens of different technical decisions, each one small, each one capable of turning into a tragedy if skipped.

Gawande, a surgeon, separates two kinds of error: errors of ignorance, when nobody yet knows the right way to solve something, and errors of ineptitude, when the right way is already known and someone still lets it slip through out of haste, fatigue, or overconfidence. A good part of medicine and of everyday life fails far more for the second reason.

Think of a rideshare driver who knows the traffic rules by heart but forgets to check the rearview mirror because he is in a hurry. He did not err out of ignorance, he knows the rule. He erred out of ineptitude: under pressure, the brain skips steps it knows by heart. This is the kind of failure the book tries to fix with a simple tool that forces memory not to skip a step.

In 1935, Boeing presented a prototype to the U.S. Army: the Model 299, a four-engine airplane, far more complex than anything flown until then. During the decisive test flight, the plane took off, climbed, and crashed minutes later. The pilot, one of the most experienced in the air force, died. The investigation concluded something unexpected: it was not a technical defect or a lack of talent. It was simply too much airplane for one pilot's head to remember everything at the right time.

Instead of giving up on the project, a group of pilots created a short list of pre-takeoff checks, from the most obvious items to the ones easiest to forget under pressure. With the list in hand, the same plane flew millions of miles without an accident and became the B-17, one of the most widely used aircraft of World War II.

The lesson Gawande draws from this is the backbone of the book: when a task becomes too complex to trust only the memory of the person doing it, the solution is not more training, it is a short sheet that holds attention on the points where it tends to slip.

One of the biggest risks for anyone admitted to an ICU is a bloodstream infection caused by the catheter used to deliver medication straight into a large vein in the neck or chest. It is a common procedure, done every day in hospitals, and for years it was treated as an unavoidable risk of the trade, part of the price of keeping a critically ill patient alive.

Dr. Peter Pronovost, an intensive care physician in Baltimore, disagreed with that resignation. He noticed that most of these infections came from trivial failures: skipping handwashing, cleaning the skin poorly before puncturing, failing to cover the whole patient with a sterile drape. None of it required expensive equipment. It only required not skipping a step.