Work in progress - Based on T3 tree, so will need to be verified as we go.
| Tech | Level | # Prereqs (1) | Prerequisites (2) | Notes |
| Agriculture | 0 | 0 | None | |
| Animal Husbandry | 1 | 0 | None | |
| Stonecutting | 1 | 0 | None | |
| Stonemasonry | 1 | 0 | None | |
| Taxidermy | 1 | 0 | None | |
| Guild Construction | 2 | 0 | None | |
| Obelisk Construction (1) | 2 | 0 | None | |
| Dowsing | ? | 0 | None | |
| Chariot Repair | 1 | 1 | Stonecutting | For cut stones |
| Beekeeping | 2 | 1 | Animal Husbandry | To open for research |
| Barley Cultivation | 3 | 1 | Agriculture | To open for research |
| Horticulture | 4 | 1 | Agriculture | To open for research |
| Stellae Construction | 4 | 1 | Stonecutting | For cut stones |
| Controlled Burn | 2 | 2 | Agriculture Stonemasonry | For leeks For limestone tools |
| Glassblowing | 1 | 3 | Controlled Burn | For charcoal and lime |
| The Science of Color | 3 | 3 | Controlled Burn | For ash |
| Basic Charcoal Production | 4 | 3 | Controlled Burn | For charcoal |
| Avian Selection | 5 | 3 | Stonecutting Barley Cultivation | For cut stones For raw barley |
| Mining | 2 | 5 | Stonecutting Glassblowing | To open for research To open for research |
| Metallurgy | 2 | 5 | Mining | For ore |
| Blacksmithing | 3 | 6 | Metallurgy | For metals |
| Advanced Metallurgy | 4 | 6 | Metallurgy | For metals |
| Improved Brick Rack Construction | 3 | 7 | Blacksmithing | For nails |
| Casting | 3 | 8 | Beekeeping Metallurgy | To open for research For metals |
| Pyramid Construction | 1 | 9 | Blacksmithing | For copper wire |
| Advanced Blacksmithing | 4 | 10 | Blacksmithing Casting | To open for researach For anvil beds |
| Neutralization | 4 | 10 | Stonecutting Casting | For pulleys for marble For kettles for potash |
| Papyrus Paper Fabrication | 3 | 11 | Stonecutting Blacksmithing Casting | For cut stones For pinch rollers For medium gears |
| Water Mining | 3 | 11 | Stonecutting Blacksmithing Casting | For pulleys For copper straps For large gears |
| Mass Production of Color | 3 | 11 | Blacksmithing Casting The Science of Color | For pigment lab For pigment lab To open for research |
| Basic Chemistry | 4 | 11 | Stonecutting Blacksmithing Casting | For cut stones For metal products For kettles for potash for glass products |
| Aromatics | 5 | 11 | Advanced Blacksmithing | For resin wedge |
| Advanced Glassblowing | 5 | 12 | Stonecutting Blacksmithing Casting Basic Chemistry | For cut stones For metal products For kettles for potash for glass products To open for research |
| Gem Cutting | 4 | 12 | Water Mining | For cuttables |
| Obelisk Construction (2) | 3 | 13 | Stonecutting Metallurgy Casting Avian Selection Obelisk Construction 1 | For cut stones For iron pot for cookpot for candles For iron pot for cookpot for candles For crushed egg shells To open for research |
| Beer Brewing | 5 | 13 | Barley Cultivation Beekeeping Papyrus Paper Fabrication | For raw barley For honey For papyrus paper for malting trays |
| Hive Optimization | 2 | 13 | Agriculture Basic Chemistry | For vegetables To open for research |
(2) Only the most terminal tech prerequisites are listed, to save space. For instance, Pyramid Construction research requires marble, glass and metal products. However, Blacksmithing (needed for copper wire) inherits all the techs needed for the other products, so it is the only prerequisite listed.
(3) Prerequisites as used here may sometimes be opened in other regions. Some prerequisites may have to be opened in your local region to even get the tech accepting donations at your region's university. (T4's wiki should distinguish between the two.)