There are two reasons why you can't get a straight answer, dear Joilette (peace to you!):
1. Those you ask don't know
2. The articles are not written by "the anointed," which causes some a problem
The WTBTS did publish, however, how articles are written. It is in their first organizational video (the one after "Purple Heart" that has the mountain scenery on the cover). In it, they show a large room filled with filing cabinets and a couple of YOUNG men perusing the articles in those files. Per the narrator, the Writing Committee simply decides on a subject (based on "need"... or the publishing cycle)... gives it to these young men (and women, yes)... and such ones pull the info from the files and use to write the new article.
Yeah, blew me away, too, when I heard of it. I heard of it when Carey Barber told me that "the GB hasn't had anything to do with the Watchtower and Awake since 1972, when we handed everything over to the 'Joshua Class' in anticipation of 1975." He was referring to the time when the GB consented to forming six "committees" of which one was the Writing Committee. This Committee is comprised of non-anointed individuals (however, my recollection is that the "head" is "usually of the anointed." It oversees the Writing Department... which publishes the material.
I think Barbara Anderson and others can give you even more, in-depth information on how the articles are literally written, literally by whom, and how.
Otherwise, I hope this helps.
Again, peace to you!
A slave of Christ,
SA