Imagery and modeling are similar cognitive processes that serve as vicarious experiences that provide information that effect self - efficacy. However, some imagery studies have shown a model of correct performance before beginning imagery to ensure that subjects are imagining the skill correctly; thus, confounding modeling and imagery. In a study that separated these factors, imagery type was not controlled. Therefore, the purpose of the present study was the comparison of the effect of modeling, internal imagery, and external imagery on self - efficacy of volleyball simple serve using a pretest - posttest matched - groups design. 48 novice female students with average imagery ability were randomly selected and matched in 4 groups based on self - efficacy (control, modeling, internal and external imagery). Data of self - efficacy at pretest and posttest were analyzed by 4(group)*2(test) ANOVA with repeated measures of test factor sand post hoc paired t test with Bonferroni adjustment. .Results indicated that the self - efficacy of modeling group and after that internal imagery and external imagery were significantly better than control groups in posttest, but there were not significant differences between self - efficacy at modeling internal and external imagery groups in pretest and post test. These findings suggest that self - efficacy is effective factor in mount motor Learning and information
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