Construction and Validation of The Leiter International Performance Scale Software For 3 To 6 Year Old Children

The present study was conducted with the aim of developing and validating the Leiter International Performance Scale software. The research method was psychometrics. Therefore, to validate the test after the software development, 200 children were selected from among all 3-6 year old children in the City of Isfahan, Iran, who attended kindergartens and pre-school centers, using the stratified random sampling. To investigate the construct validity of the scale, the Vineland Social Maturity Scale, and to study the concurrent validity, the Stanford–Binet Intelligence Scale were utilized. The test-retest reliability coefficients of the total score of the Leiter International Performance Scale software for 2 year and 1 month old to 4 year and 5 month children was .71 (p≤ .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 .82 ((p≤ .001). Furthermore, Cronbach’s alpha for 2 year and 1 month to 4 year and 5 month old children was .75 and for 4 year and 6 month to 6 year and 9 month old children, the reliability coefficient was .83. The correlation coefficient of the Leiter International Performance Scale software with the Vineland Social Maturity Scale was positive and significant (r = .61). The correlation coefficient between the Pre-school-Tehran-Stanford-Binet Intelligence-fifth edition and the Leiter International Performance Scale software was, as the evidence for concurrent validity, equal to r = .34 in the verbal subscale, and equal to r = .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.