The three most important aspects of debugging and real estate are the same: Location, Location, and Location.

The structure of a software system provides the ecology in which code is born, matures, and dies. A well-designed habitat allows for the successful evolution of all the components needed in a software system.

A class, in Java, is where we teach objects how to behave.

When building a complex system, having crackerjack programmers (who can make any design work, even a bad one) can be a liability. The result, after lots of effort, is a working system that cannot be easily maintained or upgraded. Good -but not great- programmers would fail early, causing a realization that the system must be redesigned, and then reimplemented. The extra cost is paid once, early in the system's cycle (when it is cheap), instead of repeatedly paid late in the system's cycle (when it is more expensive).

If you cannot grok the overall structure of a program while taking a shower, you are not ready to code it.

When debugging, novices insert corrective code; experts remove defective code.

Code should run as fast as necessary, but no faster; something important is always traded away to increase speed.