This study explored the relationship between locus of control, Ss skill/chance perceptions, and verifiability of feedback on Ss decision time in a letter elimination task. Ss were 72 male and 72 female undergraduates, divided into groups of internals and externals based on results from Rotter's I-E scale. In a letter elimination task, several experimental situations were enacted to determine decision times. Results showed no difference between internals and externals with respect to decision times on the tasks when taking skill/chance perceptions or verifiability of feedback into account. It was also discovered that internals exhibited a trend toward accepting skill instructions and rejecting chance instructions. The author concludes that both internals and externals are more highly motivated on a more involved type of task when they perceive their performance as being due to skill rather than to chance. The results also point out the necessity for taking into account Ss skill/change perceptions of the task employing skill/chance instructions. (Author/PC)