Two separate studies using Form IV of the Sensation-Seeking Scale (SSS) are reported. The first study correlates SSS by factor and sex with the earlier Form II SSS, supporting the reliability of the General SSS scale and discriminant validity of the Form IV SSS factor scales in relationship to general sensation-seeking. In the second study, discriminant validity is shown between factor scales of Form IV SSS and both the Eysenck Personality Inventory and Rotter's Internal-External Control Scale. (Author)