Lots of writers do use the 5W1H/5W2H framework.
It is an amazing tool in different situations where one needs to clarify or understands something in more depth.
• How much?
As you see from above: there are 5 questions starting with W and 2 starting with H.
This framework is paramount in requirements elicitation, and is widely used in TQM and QCC, which are the pillars of the Total Quality Movement.
I have been trying to find a reference that tells me where these questions came from. Although I suspect that they are from ancient times, I failed to find a reference that would point where they were first enumerated.
The oldest reference was found in Creatingminds.org, where they believe that those questions came from a Rudyard Kipling poem: “I Keep Six Honest
Serving Men ...". Beautiful poem, but I doubt that the 5W1H came from there.
If you happen to know a better origin for the 5W1H, let me know.
(07/07): As pointed out by Charlie Nguyen-Duc in his comment below,it seems that the origins of 5w1h are linked to Marcus Fabius Quintilianus.