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Hey @katyhuff,

This is also built on #5. I've added a decent amount of content and made some comments based on both your comments and content. Let's iterate on this PR as you see fit; I'm happy to change the language as needed.
Rather than "that are a mere base-set " we could speak better of ourselves by framing it as "that provide a foundation of processes on which to build a simulation" or "that provide fundamental behavior" ...