How to Measure Anything: Finding the Value of Intangibles in Business

by Douglas W. Hubbard

When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot express it in numbers, your knowledge is of a meager and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of science.

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problem well stated is a problem half solved.

There is no greater impediment to the advancement of knowledge than the ambiguity of words.