A psychiatrist named Claudio Naranjo evolved Oscar Ichazo's ego-types into the Enneagram personality types as we use them today. Naranjo largely based the types on Ichazo's passions.
Naranjo outlined the following trait structure for type 1 (Ennea-type I) in his books Ennea-type Structures and Character and Neurosis.
To learn more about Enneagram personality type 1 click here.
Click here to learn more about the nine Enneagram personality types, type variations, type origins, and how the types use the Enneagram symbol.
Click here for additional Enneagram tests on type, wing, instinct, and centers.