Perhaps it's part of my engineering background or the journalist in me, but I'm always drawn to answer the “Five Ws and How” questions, “who, what, when, where, why and how.”
In journalism, the questions constitute the formula to obtain a complete story on a subject. Hermagoras of Temnos (1st century BCE), an ancient Greek rhetorician (an expert in the use of using language effectively) is apparently the originator of the “Five Ws and How.” He defined seven “circumstances” which describe an issue as, “Quis, quid, quando, ubi, cur, quem ad modum, quibus adminiculis,” translated as “who, what, when, where, why, in what way, by what means.” (This is from Halm's edition of “De rhetorica” as Hermagoras's precise original quote hasn't survived the ages.)