In exploratory programming, it’s as important to avoid premature specification as premature optimization.

Paul Graham, Arc tutorial

There is one thing companies can do short of structuring themselves as sponges: they can stay small. If I’m right, then it really pays to keep a company as small as it can be at every stage. Particularly a technology company. Which means it’s doubly important to hire the best people. Mediocre hires hurt you twice: they get less done, but they also make you big, because you need more of them to solve a given problem.

Most people make the mistake of thinking design is what it looks like. People think it’s this veneer – that the designers are handed this box and told, ‘Make it look good!’ That’s not what we think design is. It’s not just what it looks like and feels like. Design is how it works.