This is generally true: any sizeable piece of program, or even a complete program package, is only a useful tool that can be used in a reliable fashi… - Edsger W. Dijkstra

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This is generally true: any sizeable piece of program, or even a complete program package, is only a useful tool that can be used in a reliable fashion, provided that the documentation pertinent for the user is much shorter than the program text. If any machine or system requires a very thick manual, its usefulness becomes for that very circumstance subject to doubt!