Four separate areas of definition that are not connected to each other (approximately 0.5 percent of the population). For a Quadruple-Split, the bridging gates are again the most powerful conditioning elements, and then the undefined center.
The resources in the HDKB were pulled from several places, including The Definitive Book of Human Design by Lynda Bunnel, The Book of Destinies by Chetan Parkyn/Carola Eastwood, and various other source material recordings and PDF transcripts of Ra's lectures. If you find value in this content we suggest supporting the original creators.