The Bronze Age is an anthropological archaeological term defining a phase in the development of material culture among ancient societies in Asia, the Near East and Europe. An ancient civilisation is deemed to be part of the Bronze Age if it either produced bronze by smelting its own copper and alloying it with tin, arsenic, or other metals, or traded other items for bronze from producing areas elsewhere. The Bronze Age is the middle principal period of the three-age system, following the Stone Age and preceding the Iron Age. Conceived as a global era, the Bronze Age follows the Neolithic period, with a transition period between the two known as the Chalcolithic ("Copper-Stone") Age. These technical developments took place at different times in different places, and therefore each region's history is framed by a different chronological system.