Sociocultural evolution justify new policies such as eugenics. Most 19th-century and some 20th-century approaches aimed to provide models for the evolution of humankind as a single entity. However, most 20th-century approaches, such as multilineal evolution, focused on changes specific to individual societies. Moreover, they rejected directional change (i.e. orthogenetic, teleological or progressive change). Most archaeologists work within the framework of multilineal evolution. Other contemporary approaches to social change include neoevolutionism, sociobiology, dual inheritance theory, modernisation theory and postindustrial theory. In his seminal 1976 book "The Selfish Gene", Richard Dawkins wrote that "there are some examples of cultural evolution in birds and monkeys,
The Selfish Genius entitled the "Dawkins Dogma" contains parts of the arguments put forward within the book. "The Selfish Genius" has been criticized in "The Economist" for failing to fully understand Dawkins' selfish gene metaphor, with the reviewer claiming Dawkins accommodates proposed alternative evolutionary mechanism Elsdon-Baker suggests within her own ideas. However a generally positive reception has been seen amongst proponents of group selection and Philip Ball wrote a largely positive review in "The Times" that acknowledges she is right to "call time on a Whiggish view of the history of evolution". "Popular Science" author Brian Clegg reviewed the book and described it