4. All new lines must be executed at least once. Before you are done with a feature, you have to test it. Otherwise, how do you know that it does what it is supposed to do? Often, the best way is by automatic tests, but not always. But no matter what, every new line of code has to be executed at least once.

On the other hand, by many quantitative metrics, software is still doing fine, and the whole UML exercise was only a minority pursuit at its peak.

3,000

A student of design who never touches a program again will still pick up universally useful problem-solving skills, experience a deeply creative activity, and learn to appreciate a new form of aesthetic. The rest of this preface explains in detail what we mean with “systematic design,” who benefits in what manner, and how we go about teaching it all.

Glamorous Toolkit is the moldable development environment. It is a live notebook. It is a flexible search interface. It is a fancy code editor. It is a software analysis platform. It is a data visualization engine. All in one.

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