 This entry so far has considered the two most significant motivating arguments in favor of adopting retrocausality as a hypothesis for dealing with the interpretational challenges of quantum theory. But these motivations do not by themselves amount to an interpretation or model of quantum theory.  §6  consists of a survey of a range of retrocausal models, but this section first considers perhaps the most prominent retrocausal model, the transactional interpretation. Developed by Cramer in the 1980s (Cramer 1980, 1986, 1988), the transactional interpretation is heavily influenced by the framework of the Wheeler-Feynman absorber approach to electrodynamics (see  §1);  the Wheeler-Feynman schema can be adopted to describe the microscopic exchange of a single quantum of energy, momentum, etc., between and within quantum systems.