I have a site where there are three main Doc Types: People, Projects, and Publications. I would like to be able to list related nodes for each type's main template. However, I'd rather not make my editors have to record each relationship in two places (that is, link the person to a project AND link that project to the person), nor do I want to have to define the relationship twice and introduce the possibility to inconsistency. Any thoughts on how to best tackle this?

If it helps, Publications will be added most frequently, Projects after that, and People should be the least frequently edited.

Thanks!