You don't have to be smart if you can think clearly

When you’re on fire, problems are transparent: they’re solved simply by the act of looking at them. Even complicated layers of multiple problems can simply be glanced through like stacked panes of glass. But nobody can work that way all the time.

This is a common pitfall for smart engineers. Accustomed to being able to immediately intuit the solution, the first time they run into a problem they can’t do this to is a disaster. It doesn’t even have to be a hard problem, just a problem where for whatever reason they don’t see the trick right away.

The difference between a “smart” engineer and a “strong” engineer is how they react to problems that aren’t solved instantly. A smart engineer might flail and struggle, hoping to find that flash of insight that eluded them; a strong engineer will have some process for methodically plodding away.

There’s nothing worse than working with a smart engineer on their first really hard problem. When you don’t have the muscle to grind, it’s too tempting to just take any possible solution as the right one. Smart engineers can get into an increasingly-flustered loop of pointing to a series of bad solutions. They’re liable to panic: after all, much of their professional identity is bound up in their ability to solve problems easily.

What skill do these smart engineers lack? I think it’s the ability to think slowly and clearly. Smart engineers can think clearly, but they can only think clearly at high speed. Strong engineers can think clearly all the time, even if their highest speed isn’t quite as fast. It’s like the difference between a Formula 1 car and a regular car: Formula 1 cars have a high top speed, but you couldn’t drive them in traffic, because the tyres and brakes don’t work at normal driving speeds.

When I wrote about this before in Thinking clearly about software, I said that the key is to focus on the invariants: beliefs about the system that you know are true. When you’re stuck in a puzzling situation, it’s usually…