 In contrast to monist views, proponents of “Developmental Systems Theory” (DST) (Griffiths &amp; Gray 1994, 2001) offer a radical reformulation of evolutionary theory, including the notion of inheritance and the treatment of extra-genetic inheritance. DST applies the notion of inheritance to any developmental resource that is reliably present in successive generations, and which is part of the explanation of the similarity between generations (Griffiths &amp; Gray 2001). While embracing the existence of non-genetic inheritance, and its significance for evolutionary accounts, these researchers argue against separating these phenomena into multiple channels or systems of inheritance (Griffiths &amp; Gray 2001): Inheritance phenomena are so intertwined in their effects on development, and each relies on others to have its developmental effect, that it is both more realistic and scientifically more productive not to separate them into distinct channels, systems, or replicator types. The DST approach might be characterized as “holistic” in its treatment of inheritance.