1 This study explored person-related sources of variance in athletes' efficacy beliefs and 2 performances when performing in pairs with distinguishable roles differing in partner 3 dependence. College cheerleaders (n = 102) performed their role in repeated performance 4 trials of two low-and two high-difficulty paired-stunt tasks with three different partners. Data 5 were obtained on self-, other-, and collective efficacies and subjective performances, and 6 objective performance assessments

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... e obtained from digital recordings. Using the Social 7 Relations Model framework, total variance in each belief/assessment was partitioned, for 8 each role, into numerical components of person-related variance relative to the self, the other, 9 and the collective. Variance component by performance role by task-difficulty RM-ANOVAs 10 revealed the largest person-related variance component differed by athlete role and increased 11 in size in high-difficulty tasks. Results suggest the extent athlete performance depends on a 12 partner relates to the extent the partner is a source of self-, other-, and collective efficacy. 13