Why the 17:18 series?

In Deuteronomy 17, Moses is leaving final instructions concerning the future of Israel. As a prophet of God, Moses foretells of when Israel will place a king over the nation (v. 14). In verse 18, the king is commanded to not simply acquire a copy of the law (the entire book of Deuteronomy) from the "scroll publishing house," but to hand write his own copy of the law. Thirty-four hundred years later, educators are "discovering" that students that physically write out their notes by hand have a much greater retention rate than simply hearing or visually reading the information. Apparently, God knew this to be true of the kings of Israel also. From such understanding came the conception of this series of books.