 Evolutionary psychology is sometimes described as psychology that is informed by evolutionary theory and sometimes described as the latest version of sociobiology. Evolutionary psychology differs from sociobiology in several respects. Instead of looking for adaptive explanations for particular behaviors, evolutionary psychologists develop adaptive hypotheses for psychological mechanisms that generate behaviors and tend to assume a modular theory of mind. Whereas there is incredible diversity of human behavior, many evolutionary psychologists postulate a smaller number of mechanisms or modules that are responsible for a range of behaviors. Much work in evolutionary psychology relies on evolutionary theoretical foundations and psychological empirical methods. Major themes in evolutionary psychological research include studies of social exchange (Cosmides 1989, Cosmides and Tooby 1992, Tooby and Cosmides (1992), family dynamics and conflict (including violence against stepchildren (Daly and Wilson 2005) and wives (Wilson and Daly 1998)), and human mate choice and sexual jealousy (Buss 2003, 2005).