- A person won’t become proficient at something until he or she has done it many times. In other words, if you want someone to be really good at building a software system, he or she will have to have built 10 or more systems of that type.
- A person won’t retain proficiency at a task unless he or she has at one time learned to perform that task very rapidly. Learning research demonstrates that the skills of people who become accurate but not fast deteriorate much sooner than the skills of people who become both accurate and fast.
– Philip Greenspun