The approach to the record of the past known as the history of ideas takes the position that the apparent stream of thought or argument about an area of knowledge can be analyzed usefully by considering that the component concepts or notions in that stream have been produced by individual minds acting in given sociocultural settings at identifiable moments in time. The development of notions as they are visible down through time in the documents can be considered analogous to tributary streams running into a river system. The river itself may exhibit tortuous channels, eddies, backwaters and sinkholes in the sand in addition to receiving additions to its flow. For example, it is likely that some one person at one moment in history came up with the idea that the Magdalena River was the river Sidon, then that point was picked up by others. Another person at another moment first stated that the Usumacinta River was the Sidon, whereupon the two ideas were put into competition. And so on.

By isolating such contributions to thought, we may be able to clarify why certain geographical propositions flourished and others did not in terms of the intellectual, communicative and social settings of those who paid attention to these matters. Taken all together, such analyses have the potential to illuminate the channeling forces that have kept the stream of thought running within its evident banks instead of taking other lines. Only by trying to do this will we learn whether there is value in the picture produced that may free us of some unproductive historical predispositions. At the least we should be able to see better how far we are from the head of the river, and we may even glimpse its mouth. (Of course, those who do not accept the Book of Mormon as an authentic ancient document would say that this whole stream runs into an intellectual dead sea where nothing lives!)

Most historical material of interest here is organized not in terms of individual notions, ideas or geographical motifs but of "models." Each of those who have thought and written on the geography of Book of Mormon events has tended to develop a relatively consistent picture of the features fitted together. Such a picture I term a model. Thus the "Driggs 1925 Model" referred to later on consists of that set of geographical ideas represented in a brochure first printed (as far as I can tell) by Jean Russell Driggs in Salt Lake City in 1925. Since I am interested in the history of ideas, not just a publishing history, in cases where I am aware that a person crystallized a certain idea or constellation of ideas prior to the earliest formal publication accessible to me, I have dated the model from the earlier moment rather than from the publication date.