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  2. Evolution - Wikipedia

    en.wikipedia.org/wiki/Evolution

    Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]

  3. Multilineal evolution - Wikipedia

    en.wikipedia.org/wiki/Multilineal_evolution

    Multilineal evolution is a 20th-century social theory about the evolution of societies and cultures.It is composed of many competing theories by various sociologists and anthropologists.

  4. Emergent evolution - Wikipedia

    en.wikipedia.org/wiki/Emergent_evolution

    The term emergent was first used to describe the concept by George Lewes in volume two of his 1875 book Problems of Life and Mind (p. 412). Henri Bergson covered similar themes in his popular 1907 book Creative Evolution on the Élan vital.

  5. Normal Accidents - Wikipedia

    en.wikipedia.org/wiki/Normal_Accidents

    Normal Accidents: Living with High-Risk Technologies is a 1984 book by Yale sociologist Charles Perrow, which analyses complex systems from a sociological perspective.. Perrow argues that multiple and unexpected failures are built into society's complex and tightly coupled systems, and that accidents are unavoidable and cannot be designed a