Functionalism was an anthropological theory that challenged theories of unilinear evolution and historical particularism. It focused on understanding the role of cultural traits and practices in contemporary societies rather than seeking origins. There were two strands represented by Malinowski and Radcliffe-Brown. Malinowski focused on present-day fieldwork and believed customs developed to fulfill universal biological needs. Radcliffe-Brown viewed historical explanations as conjectural and advocated examining the role of cultural practices in modern societies. He believed anthropology should be synchronic rather than diachronic.