 At the beginning of this entry it was claimed that the case for cultural evolution was irresistible. No one can deny that cultural inheritance is an important factor in explaining how our species has changed over time. Cultural inheritance is not merely a process that acts in parallel to genetic evolution, it is intertwined with genetic evolution. Cultural changes bring about alterations to the environment, which in turn affect both how genes act in development, and what selection pressures act on genes. In spite of all this, one might still worry that it is a mistake to understand the importance of culture using the tools of evolutionary theory. This is because one may be sceptical of the existence of a theory that is both general enough to cover all forms of cultural change, and informative enough to be enlightening.