| 1-3 | No Cultivation. Hunting, Fishing, & Gathering are common means of Subsistence. |
| 4 | INCIPIENT AGRICULTURAL practices, Primitive Dams as irrigation, & Widespread Clearing of forested land. Crude plows, stone sickles, digging sticks, & Saddle querns aide Cultivation efforts. |
| 5 | Animal Husbandry and Widespread Cultivation. HOE, Pit Silos, Primitive Crop Rotation, & Drainage. |
| 6 | Basin Irrigation, Water-Raising Devices, Canals, & Dikes. Also Dams and Wooden plows. |
| 7 | CHANNEL IRRIGATION, Aqueducts abov ground-level, & Better Fertilization Techniques. |
| 8-9 | Farming Implements edged with Bronze. Animal and Waterpowered Scoop Wheels raise Water. |
| 10 | Hoes & Mattocks edged with Iron. Metal Sickles and Reapers. Scientific Stock Breeding. |
| 11 | Two Field System of Agriculture, Domesticated Oxen & Mules, Composting and Manuring for Fertilization, & Marl (lime, clay, and sand). Iron Tools (spades, rakes, scythes, and shovels), Wheeled Plows, Oil Presses, & Reservoir Sluice Gates. IRON PLOWSHARES & COULTERS. |
| 12 | HORSE COLLAR (enables horses to be employed as draft beasts -- more efficient than Oxen) & Jointed Agricultural Flail. |
| 13 | Great Canals for transport and irrigation, Terraced Fields, Pond Fields, & Open Field System or Agriculture (long scattered strips separated by furrows). |
| 14 | Deep Water Drift nets (fishing), THREE FIELD SYSTEM OF Crop Rotation, Soil Conservation, & Wheeled Assymetrical Plows with Rudimentary moldboards). |
| 15 | MOLDBOARDS for Plows (turns hard, rocky earth more easily) & Shifting Cultivation Methods. |
| 16 | Large-scale Clearance and Drainage of marshy and forested areas, Step Wells with artificial lakes, & Polders (land reclaimed from the sea). WINDMILLS |
| 17 | Extensive Horse-breeding Programs & Urban Refuse as Fertilizer. |
| 18 | Floating Gardens & Many Open Fields for Grazing. |
| 19 | Legumes and Root Crops introduced into Rotation (prevents the need for Fallow Fields). |
| 20 | Increased emphasis on Fodder Crops -- leads to Four Course System of Agriculture. |