The Tiegers I have said for years is a hybrid similar to Otto Kroeger. You’re right they make the attempt to simplify type, which continues to confuse readers when they attempt to correlate with the more in-depth work of Myers-Briggs and Jung. Jung, Myers-Briggs, John Beebe, Lenore Thomson, Naomi Quenck, etc are Jungian followers. Lenore Thomson made that known during her debate with Keirsey years ago, reminding him that his work is temperament and does consider the basic qualities of what makes MB different. The Tiegers and Otto Kroeger go equally as far as in their hybrids which in my personal opinion are too rudimentary. They do not discuss their work using cognitive functions but in part Keirsey and Myers Briggs (not Jung). In fact if you are going to consider any hybrid work at least Berens/Nardi’s is applicable. Sorry Mom I still have to disagree.