Sorry if this is in the wrong spot, but it seems more history-based than science-based.
I've been working on a civilization level chart, similar to Michio Kaku's Type Civilzations. Mainly for my fictions, but hopefully it can become widely known and used to categorize extraterrestrial civilizations by scientists.
Level 1 - Nomadic
Level 2 - Stone
Level 3 - Bronze
Level 4 - Iron
Level 5 - Medieval
Level 6 - Renaissance
Level 7 - Industrial
Level 8 - Information
Level 9 - Interplanetary
Level 10 - Interstellar
Level 11 - Intergalactic
It's not fully fleshed-out, yet. However, I hope this is enough to give you guys an idea. I've considered expanding the space levels into more eras. So, feel free to give your opinions.