The present study  aimed at developing a test for assessing children's competency. One hundred children (50 male and 50 female) participated in this study. Subjects were selected randomly from Shiraz second grade middle school students. He items for this test were adopted from Pep and Tennessay Test. Reliability coefficient (test-retest after 15 days) was 0.86. The validity of the test was assessed through correlating children's scores on the Competency Test with their fathers' and mothers' reports which were 0.73 and 0.86 , respectively. The correlation between Competency Test and Child Depression Scale was 0.6. Comparison of the male and female students' scores revealted no significant sex difference in terms of competency except in the area of physical competency.