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This self-report instrument assesses multiple facets of self-concept across distinct life domains. The Self-Description Questionnaire III (SDQ-III) is intended to support a more differentiated profile of perceived strengths and weaknesses rather than a single global score. It was originally developed by Herbert W. Marsh.
The measure includes 35 items and typically requires about 7 minutes to complete. Items ask respondents to rate how well statements describe them, yielding domain-based indices that can be used in clinical, counseling, educational, or research settings to characterize patterns of self-perception and to inform hypothesis generation or treatment planning. Interpretation should consider the respondent’s developmental context and the use of appropriate norms or reference groups when available, and the Self-Description Questionnaire III (SDQ-III) should be integrated with other assessment data rather than used as a stand-alone diagnostic tool.