A movement which began in America in the 1960s, aimed at making archaeology more scientific, now more often called processual archaeology. It was suggested that explanations be based on carefully designed models of human behavior and emphasized the importance of understanding underlying cultural processes. This new approach was controversial and is commonly associated with Lewis R. Binford and his students. Binford's "New Perspectives in Archaeology" in 1968 stressed the following ideas: the use of new techniques such as the computer for statistical and matrix analyses of data and concept of the ecosystem for the understanding of the economic and subsistence bases of prehistoric societies; an evolutionary view of culture; the use of models of cultures viewed as systems incorporating the evolutionary view of culture and a close relationship between archaeology and anthropology. Although the proponents of the new archaeology have been criticized by more traditionally minded scholars their basic principles are now widely accepted.