Developed a test of rational-irrational beliefs based on Ellis' (1962) rational emotive theory with cultural modifications made for use in Jordan. The assumptions of Ellis' theory that negative feelings are caused by irrational beliefs, and that changing these beliefs can reduce these feelings are central to the study. The test comprised Ellis' list of 11 common Western irrational ideas with 2 additional common Jordanian irrational ideas. The 13 ideas fall under the following 4 test areas: frustration and worry, idealism and perfection, love and membership, and personal relationships. The latter category contains the Jordanian ideas that (a) it is necessary for a person to be formal and serious to gain the respect of others, and (b) the position of a man is the most important factor in his relationship with a woman. The test was administered to 100 normal Ss and 85 Ss suffering from nervous afflictions. Discriminant, concurrent, and factorial validity were proven. Test-retest showed a reliability coefficient of 85% on the total score. Internal consistency using Cronbach Alpha showed a reliability coefficient of 92%.