Author(s)

Koji Kudo

Department of Educational Psychology, Tokyo Gakugei University, Tokyo, Japan.

This study addressed the insufficient verification of reliability and validity of the Differentiation of Self Scale in Two Domains (DSS-2D). Although the DSS-2D is the first measure in Japan that satisfies the three requirements (corresponding to two domains, applicable to a wide range of adolescents, and a moderate number of items), verification of reliability and validity of the DSS-2D has remained insufficient. Two questionnaire surveys were conducted with university students (n = 70 at T1, n = 68 at T2). The interval of the surveys was one month. The results indicate that the DSS-2D had sufficient test-retest reliability and concurrent validity in each domain of differentiation of self. These results provide support for the DSS-2D as a valid and adequate measure for use in Japan.

Differentiation of Self, Domain Specific Validation, Interpersonal Domain, Intrapsychic Domain, Test-Retest Reliability

Kudo, K. (2018) An Additional Consideration of Reliability and Validity of the Differentiation of Self Scale in Two Domains. Psychology, 9, 2411-2421. doi: 10.4236/psych.2018.910138.