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Four studies evaluate the new Self Description Questionnaire II short-form (SDQII-S) that measures 11 dimensions of adolescent self-concept based on responses to 51 of the original 102 SDQII items and demonstrate new statistical strategies to operationalize guidelines for short-form evaluation proposed by GT Smith, DM McCarthy, and KG Anderson (2000). Multiple-group confirmatory factor analyses revealed that the factor structure based on responses to 51 items by a new cross-validation group (n= 9,134) was invariant with the factor structures based on responses to the same 51 items and to all 102 items by the original normative archive group (n= 9,187). Reliabilities for the 11 SDQII-S factors were nearly the same and consistently high (. 80 to. 89) for both groups. Multitrait-multimethod analyses support the internal validity of responses over time. Gender and age effects on the 11 SDQII-S factors were …