In video games, characters can often aquire new skills, weapons, tools, etc. Usually one must achieve skills in a particular order. This is called a "tech tree". I am working on such a system, but not for a video game. I don't want to call it a tech tree, because search engines would have a hard time finding this particular thing in all the noise. I am looking for some plain spoken alternatives. (All my alternatives end up sounding pompous or outrageous, like translating tech tree into Latin, etc)
@Amy asked for more context. I should probably put that context up here in the main question too...
Carl Sagan once said, "If you want to bake an apple pie from scratch, you must first invent the Universe." For a long time I have been collecting books, papers, and sometimes artifacts, that would allow a person to follow the trail of some topic in the library all the way down to first principles. I am now looking into doing this digitally, and I have been stumped trying to name the project. I've always just called it my library, but that doesn't work well as a public name.