The best computer programmers never write a new program when they can use an old one for a new job. - Gerald M. Weinberg

problem-solving leaders have one thing in common: a faith that there’s always a better way

If you don't have questions about a product's risks, then there's no reason to test. If you have at least one such question, then ask: Will these tests cost more to execute than their answers will be worth?

Fisher's Fundamental Theorem states — in terms appropriate to the present context — that the better adapted a system is to a particular environment, the less adaptable it is to new environments.