Preface
There are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns—there are things we do not know we don’t know.
—U.S. Secretary of Defense Donald Rumsfeld, February 12, 2002
While the above statement was met with chuckles from those attending the press briefing, it summarizes an important principle that is as relevant in complex technical systems as it is in geopolitics: performance issues can originate from anywhere, including areas of the system that you know nothing about and are therefore not checking (the unknown-unknowns). This book may reveal many of these areas, while providing methodologies and tools ...
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