The Efficacy Scale for Creative Productivity (ESCreP) was developed to measure students' convictions that they could be creative producers. Self-efficacy, an individual's estimation of ability to perform a behavior, is based upon performance accomplishments, vicarious experiences, verbal persuasion, and emotional or physiological arousal. Three types of activities designed to provide enrichment for gifted students are related to efficacy: (1) exploration of topics; (2) training in processes necessary to carry out investigations; and (3) student-initiated investigations of problems. The 40-item ESCreP was pilot tested with 369 gifted students in grades 4 to 12. Test reliability ranged from .71 to .94. Completion of type 3 activities was the best predictor of creative productivity efficacy scores. Years of participation in the gifted program were also significant, but grade level and sex were not. The six-item Efficacy Scale for Overall Creative Productivity (ESOreP), administered to 294 gifted students is grades 4 to 8, measured efficacy at completing a type 3 project, rather than performing the parts of one. Internal consistency was .78 and test-retest reliability was .56. The relationship between the parts versus whole issue was ambiguous. (Both scales and a combined 46-item test are appended.) (GDC)