You found an excellent Privacy Paper Categorization Framework here! I think the challenge at this point would be trying to find a paper that doesn't fit into one of these categories. We could even fit news articles into some of these as well lol.
Shame on you for failing to cite your source*.
Randall Munroe is an excellent scientist (physicist) and computer specialist who happens to do great cartoons.
Image URL (for hotlinking/embedding): https://imgs.xkcd.com/comics/types_of_scientific_paper.png
Plus, the way you did it folks miss his rollover!
* Note: You are welcome to reprint occasional comics pretty much anywhere (presentations, papers, blogs with ads, etc). If you're not outright merchandizing, you're probably fine. Just be sure to attribute the comic to xkcd.com.
... *my* source was someone who failed to cite *his* source
so you can join in and heckle me on the point 🙂
So, what you are saying is that *your* source remains neither xkcd nor cited 😀.
I do concur that Randall is great.