“To build a software that your users understand, capture the language of that users in a class diagram.”

“most software- or systems-development projects start out without a context diagram, blissfully unaware that they need one.”

“The first diagram that you need on any project is a context diagram.”

“Many of the modeling mistakes are modeler's poor listening skills.”

“With composition, parts can’t be shared with other objects. The life of the part is completely within the life span of the whole.”

“Users are a double-edged sword. They can help you improve your language, but they can also deter you from improving. So choose your users carefully, and be slow to grow their number. Having users is like optimization: the wise course is to delay it.”

“Network administrators all share an abiding and passionate desire for one thing: We want our users to shut up.”