| Abstract:
The present study aimed at developing and validating the Leiter International Performance Scale Software. The research method was psychometrics. Therefore, after developing the software, to validate the test, from among all 3-6 year old children in the City of Isfahan 240 children were selected using the stratified random sampling and participated in the study. To investigate the construct validity of the scale, the Vineland Social Maturity Scale and to investigate the concurrent validity, the Stanford– Binet Intelligence Scale were used. The test-retest reliability coefficient of the total score of the Leiter International Performance Scale Software for 2 year and 1 month to 4 year and 5 month children was 0. 71 (p≤ 0. 001). In addition, the reliability coefficient of the total score of the Leiter International Performance Scale Software for 4 year and 6 month to 6 year and 9 month old children was 0. 82 ((p≤ 0. 001). The Chronbach’ s alpha coefficient for 2 year and 1 month to 4 year and 5 month old children was 0. 75 and for 4 year and 6 month to 6 year and 9 month old children, it was 0. 83. The correlation coefficient of the Leiter International Performance Scale Software with the Vineland Social Maturity Scale was positive and significant (r = 0. 61). The correlation coefficient between the Stanford-Binet Intelligence Scale and the Leiter International Performance Scale Software, as an evidence for the concurrent validity, was r = 0. 34 in the verbal subscale and r = 0. 75 in the non-verbal subscale. The results of the present study indicated that the Leiter International Performance Scale Software can be considered as a valid and reliable instrument for measuring children’ s intelligence.
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