Cover page by Eric Evans

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Appendix. The Use of Patterns in This Book

My first “nice car,” which I was given shortly after college, was an eight-year-old Peugeot. Sometimes called the “French Mercedes,” this car was well crafted, was a pleasure to drive, and had been very reliable. But by the time I got it, it was reaching the age when things start to go wrong and more maintenance is required.

Peugeot is an old company, and it has followed its own evolutionary path over many decades. It has its own mechanical terminology, and its designs are idiosyncratic; even the breakdown of functions into parts is sometimes nonstandard. The result is a car that only Peugeot specialists can work on, a potential problem for someone on a grad student income.

On one typical occasion, I ...

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