French colonial policy incorporated concepts of assimilation and association. Based on the assumed superiority of French culture, in practice the assimilation policy meant the extension of French language, institutions, laws, and customs to the colonies. The policy of association also affirmed the superiority of the French in the colonies, but it entailed different institutions and systems of laws for the colonizer and the colonized. Under this policy, the Africans in Ivory Coast were allowed to preserve their own customs insofar as they were compatible with French interests.