Enhanced self-attitudes following a psychotherapeutic encounter almost always serve as an indicator of therapy success. In an attempt to enhance self-attitudes through the use of positive mental imagery, undergraduate students (N=72), divided into 4 groups, participated in 4 experimental sessions. The experimental groups imagined themselves exhibiting 10 different desirable personality characteristics (positive imagery) identified as being either common or uncommon self-attributes. The control groups imagined themselves in 10 different outdoor scenes (neutral imagery). To examine the effects of relaxation training on vividness of imagery, two of the groups learned relaxation techniques. All groups participated in three imagery sessions either with or without relaxation training. In the fourth session, which they believed was part of another experiment, the students completed the Tennessee Self-Concept Scale, the Rosenberg Self-Esteem Scale, and a revised Fishbein and Ajzen-type scale of self-attitude, containing the 10 personality characteristics used in the positive imagery condition. Statistical analyses showed that positive imagery significantly affected self-attitude in a positive direction on the Fishbein and Ajzen-type scale but not on the other measures. Enhanced self-attitude resulted primarily from an increase in the affective evaluation of the 10 uncommon personality characteristics. (Author/WAS)