“I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind; it may be the beginning of knowledge, but you have scarcely in your thoughts advanced to the state of Science, whatever the matter may be.”
-Lord Kelvin, Electrical Units of Measurement, 1883
“It is a capital mistake to theorize before one has data.”
-Sherlock Holmes in A Scandal in Bohemia
If we were to describe the culture at Google in a single phrase, “data driven” might come to mind. “Evidence based” might be another way of saying it, ...