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| Rule of Modularity: Write simple parts connected by clean interfaces. | |
| Rule of Clarity: Clarity is better than cleverness. | |
| Rule of Composition: Design programs to be connected with other programs. | |
| Rule of Separation: Separate policy from mechanism; separate interfaces from engines. | |
| Rule of Simplicity: Design for simplicity; add complexity only where you must. | |
| Rule of Parsimony: Write a big program only when it is clear by demonstration that nothing else will do. | |
| Rule of Transparency: Design for visibility to make inspection and debugging easier. | |
| Rule of Robustness: Robustness is the child oftransparency and simplicity. | |
| Rule of Representation: Fold knowledge into data, soprogram logic can be stupid and robust. | |
| Rule of Least Surprise: In interface design, always do theleast surprising thing. | |
| Rule of Silence: When a program has nothing surprising to say, it should say nothing. | |
| Rule of Repair: Repair what you can — but when you must fail, fail noisily and as soon as possible. | |
| Rule of Economy: Programmer time is expensive; conserve it in preference to machine time. | |
| Rule of Generation: Avoid hand-hacking; write programs to write programs when you can. | |
| Rule of Optimization: Prototype before polishing. Get it working before you optimize it. | |
| Rule of Diversity: Distrust all claims for “one true way”. | |
| Rule of Extensibility: Design for the future, because it will be here sooner than you think. |
