“"How to test?" is a question that cannot be answered in general. "When to test?" however, does have a general answer: as early and as often as possible.”

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Do you have more details about the quote ""How to test?" is a question that cannot be answered in general. "When to test?" however, does have a general answer: a…" by Bjarne Stroustrup?
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Bjarne Stroustrup 30
Danish computer scientist, creator of C++ 1950

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“The right way to ask the question is: How does the concept of a point fit into the logical structure of Euclid's geometry? …It cannot be answered by a definition.”

Source: Infinite in All Directions (1988), Ch. 2 : Butterflies and Superstrings, p. 17
Context: Euclid... gave his famous definition of a point: "A point is that which has no parts, or which has no magnitude." …A point has no existence by itself. It exists only as a part of the pattern of relationships which constitute the geometry of Euclid. This is what one means when one says that a point is a mathematical abstraction. The question, What is a point? has no satisfactory answer. Euclid's definition certainly does not answer it. The right way to ask the question is: How does the concept of a point fit into the logical structure of Euclid's geometry?... It cannot be answered by a definition.

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“Science is empirical: knowing the answer is nothing. Testing your knowledge means everything.”

Lawrence M. Krauss (1954) American physicist

"A Universe From Nothing" by Lawrence Krauss, AAI 2009 http://www.youtube.com/watch?v=7ImvlS8PLIo#t=23m40s (23:40-23:48)

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“I took a test in Existentialism. I left all the answers blank and got 100.”

Woody Allen (1935) American screenwriter, director, actor, comedian, author, playwright, and musician
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