The mode of production of a society is its method of producing the niceties and necessities of life: from food, clothing, and shelter to nurturing, health-care, and scientific and cultural products. In Karl Marx's theory of historical materialism, the humyn race has passed through a succession of modes of production, beginning with prehistoric primitive communism, and followed by that, ancient slave societies, feudalism, and the present mode of production, capitalism. Karl predicted that the next mode of production would be socialism, which would occur in two phases, a lower stage, often also called socialism, and an upper (later) stage called communism. In Asia in past centuries, another mode, the Asiatic mode of production is also said to have existed. Each mode of production can be analysed as consisting of forces of production and relations of production. The forces of production are the material requirements of production: things such as tools, technology, raw materials, and the labour power of humyn beings. Changes in the forces of production, eg., advances in technology, are the root cause of the historical movement from one mode of production to the next.