There is no single authoritative description of the nine Enneagram personality types. Instead, there are a number of different schools, authors, and teachers who have their own interpretation of the types. Some of the differences between these interpretations are subtle and not very noticeable while others are more obvious. There are two general approaches to dealing with this: 1) use the descriptions of one interpretation or source as a basis for understanding the types or 2) piece together an understanding from multiple interpretations and sources. Below are links to a sampling of type descriptions from a variety of authors/schools.