a scale, in Scientology, which shows the emotional tones of a person. These, ranged from the highest to the lowest, are, in part, serenity, enthusiasm (as we proceed downward), conservatism, boredom, antagonism, anger, covert hostility, fear, grief, apathy. An arbitrary numerical value is given to each level on the scale. There are many aspects of the Tone Scale and using it makes possible the prediction of human behavior. A copy of the Tone Scalecan be seen in the appendix of this volume. —PDC Volume 5 Approved Glossary