Abstract
ABSTRACT Objective: Psychological maturity can be comprehended as a multifaceted construct encompassing various psychosocial, emotional, and cognitive attributes. The aim of this study was to investigate evidence of validity of the Psychological Development Index for the Comprehensive System Zulliger Test. Method: The data analysis considered the Mann-Whitney test, Cohen's d, Spearman's correlation and the coefficient difference test. Finally, multiple regression analysis was used to verify the relationship between age and Developmental Index with a 253 children and adolescents between 7 and 14 years of age participated. Results: The results indicated evidence of concurrent criterion validity to Development Index, pointing out statistically significant differences between age groups. Conclusion: Regarding the evidence of convergent validity of the Development Index between the Zulliger Comprehensive System and the Rorschach Performance Assessment System tests, nothing can be proven. This study is limited by the age range of the sample, as well as the transposition of the Rorschach Performance Assessment System Development Index calculation to the Zulliger Comprehensive System.
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