 It is now fairly common in biological discourse to talk about various forms of inheritance in addition to genetic inheritance. The two types of inheritance most often referred to are probably cellular epigenetic inheritance and cultural and behavioral inheritance in humans and various animals. There is however no standardized or de facto system or nomenclature used to classify inheritance systems and their properties. This is partly due to the wide range of hereditary phenomena and the debates described earlier. A principled taxonomy would provide a guide for identifying inheritance systems, delimiting them from one another, comparing their properties and possible functions, and so on.