Types of knowledge

So a project I've been thinking about (for years) is a method of classifying knowledge.  Obviously there are many systems, but I want to have my own in place before I start researching others.  Though I gotta say, "known knowns, known unknowns, and unknown unknowns" is a pretty sweet method.

Definitions-
                When does red become orange?
Protocols-
                 PEMDAS
Useful lies-
                 Species concepts
Truths-
               unknowable, but do exist

I don't feel like finishing this at the moment, but I'll come back to it.


I'm back

So, oddly enough, I started a job homeschooling a kid whose father is a data head and basically likes to classify information.  Huh. He does computer programming stuff, which makes me think I might actually enjoy that if I were willing to give it a chance.  Something to think about later.

Also I had a conversation with a friend about the term "niche" as an ecology term.  Which is leading me into thoughts about nouns and abstract nouns.  Maybe I should look at a grammar book?