1. Technology

2. New Technologies Major Roads of the Inca Empire

3. Khipu (Quipu)‏ A khipu consists, minimally, of a main cord from which pendant cords hang. (Pendants of pendants are called subsidiaries.) Knots tied in the pendant cords and other modifications of the pendant are the commonest data-bearing or significant features. Inka functionaries used cord records for censuses, inventories, tribute records, and documents about transactions; Spanish courts also accepted them as documents of record in early colonial times.

4. Economic Developments constructed aquaducts, cities, temples, fortresses, short rock tunnels, suspension bridges, 2250mi road system metal works of alloy, copper, tin, bronze, silver gold developed important medical practices- surgery on human skull, anesthesia resources-corn, potatoes, coffee, grain created woven baskets, woodwinds