1. Maturity. The ability to not whine about every little problem one runs into, but Google it down quickly and fix it right away. This is about persistence. I f

1. Maturity. The ability to not whine about every little problem one runs into, but Google it down quickly and fix it right away. This is about persistence. I find it difficult to work with people I have to motivate at every step of the way through a project. 2. Holding a program in one's head. I'm not sure really whether to attribute this to PG or Peter Norvig, or somebody else. The best way to understand this is really to experience it in practice. Everyone finds it difficult to keep a mental image of a project once it starts to grow, but it seems like some programmers have an especially hard time with this.