Rejecting the comparative unilineal models that assigned each culture to an evolutionary stage, a number of cultural anthropologists developed a radically different approach that attempts to understand each contemporary culture in its own terms. Functionalism seeks to understand the purpose of the elements and aggregates of culture in the here and now. Bronislaw Malinowski, an early proponent of this approach, argued that the function of culture is to meet human needs. All humans need to satisfy the need for food, clothing, and shelter. The fundamental purpose of culture is to provide a means of satisfying those needs. In the course of meeting those basic needs, humans in all cultures develop a set of derived needs—that is, needs derived from the basic ones. Derived needs include the need to organize work and distribute resources. Family structures and gender roles are examples of cultural elements addressing these derived needs. Finally, cultures also address a set of integrative needs, providing people with guiding values and purpose in life. Religion, law, and ideologies fulfill these integrative needs. Malinowski sought to understand both the biological and psychological functions of culture. At first glance, this approach may not seem all that different from evolutionary approaches that identify the core set of cultural features devoted to human survival. What was so different in Malinowski’s approach was his attempt to show that even so-called primitive societies had functionally complex cultural systems for meeting the full array of human needs. Malinowski’s three-volume ethnography of the economics, religion, and kinship of the Trobriand people of Papua New Guinea demonstrated this fact in striking and elaborate detail. A second version of functionalism, advocated by British anthropologist Alfred R. Radcliffe-Brown, identified the functions of various elements of culture in a slightly different way. Rather than looking for the way culture satisfies biological or psychological needs, structural functionalism focused more on how the various structures in society reinforce one another. Culture is not a random assortment of structural features but a set of structures that fit together into a coherent whole. Common norms and values are threaded through the family structure, the economy, the political system, and the religion of a culture. Structural functionalists conceptualized culture as a kind of machine with many small parts all working in tandem to keep the machine operating properly. While recognizing the value of this approach, contemporary anthropologists have complicated the mechanistic model of culture by pointing out that the various elements of culture come into conflict just as often as they reinforce one another. Although few anthropologists would now identify themselves as structural functionalists, the holistic approach to culture as an integrated system is derived from this important theoretical foundation.