The Enneagram appears to be a hybrid of older traditions (Seven deadly sins, Kaballah, Sufi, Chaldean Seal, Gnosticism) based largely on intuition (in an unscientific era). Claudio Naranjo westernized it, and most current authors owe much of their work to his ideas. As a nine trait personality system, I have found the Enneagram definitely has some descriptive value (as I think any personality system with sufficiently distinct traits does). There is still some variance among the trait descriptions from author to author and since the Enneagram lacks a clear structure, scientific rational, it will always be hobbled by which description is more accurate. There are also overlap / orthogonality issues, i.e. some Enneagram types correlate with each other.