The Functions of Enthusiasm and Practical Action:
The potential for responsiveness, productivity, achievement, skill
and the desire for change and variety.
Negatively, the potential for hyperactivity, superficiality, impulsiveness,
excessiveness, and escapism.
Don Richard Riso
Discovering Your Personality Type:
The Enneagram Questionnaire
Houghton Mifflin Company, 1992, 118 pages