Kathleen V. Hurley & Theodore E. Dobson's book, "What's My Type?" offers the clearest method for understanding which of the nine of the Enneagram's personality types you actually are.
Each of the nine points on the Enneagram correspond to a numbered personality type.
Each of these nine personality types is characterized by its own unique major personality flaw. These personality types are:
1.) anger
2.) pride
3.) deceit
4.) jealousy
5.) greed
6.) fear
7.) gluttony
8.) lust
9.) sloth
Whether we care to admit it or not, we know ourselves very well. It's very hard to deny the obvious in our failings.
But don't despair that this way of viewing personality is too "negative"! It's actually a great first step toward getting to know yourself better. The clarity of Kathleen V. Hurley's & Theodore E. Dobson's method gives you a very solid, very practical understanding what you need to do to improve yourself.
Essentially, the underlying differences in the characteristics of the nine enneagram personality types are a matter of how the personality types use instinct, emotion, and thought to arrive at the sort of decisions that are typical for each of the nine personality types. ("Instinct" is knowing without knowing how you know. The authors provide this very useful description of instinct in their book.)
As brilliant as the approach that Kathleen V. Hurley & Theodore E. Dobson have adopted in their understanding of the Ennegram - that the nine points on the Enneagram correspond to nine personality types, each personality type having one of nine major personality flaws - their theoretical explanation for the underlying differences in personality types would benefit from a sharper writing style.