The purpose of this investigation is to examine empirical support for the internal/external (I/E) frame of reference model that describes the relation between Verbal and Math self concepts, and between these academic self concepts and verbal and math achievement. The empirical tests are based on all studies (n = 6,010; age range = 7-35+ years) that have employed the Self Description Questionnaire (SDQ), SDQII, or SDQ III self-concept instruments. The I/E model posits, for example, that a high Math self-concept is more likely when math skills are good relative to those of peers (an external comparison) and when math skills are better than verbal skills (an internal comparison). Consistent with the model and empirical findings, (a) Verbal and Math self-concepts are nearly uncorrected with each other even though verbal and math achievement indicators are substantially correlated with each other and with the matching areas of self-concept; (b) the direct effects of math achievement on Verbal self-concept, and of verbal achievement on Math self-concept, are both negative. For inferred selfconcepts based on the ratings of external observers, the external process seems to operate, but not the internal process. The findings demonstrate that academic self concepts are affected by different processes than are the academic achievement areas they reflect and the inferred self-concepts offered by external observers.The purpose of this investigation is to present theoretical and empirical support for the internal/external (I/E) frame of reference model that describes how Verbal and Math self-concepts are formed. The modelThe author would like to thank Samuel Ball, Jennifer Barnes, Raymond Debus, and Richard Shavelson for their helpful comments on earlier drafts of this article, and to thank my coauthors in earlier studies that are incorporated into the present investigation.' For purposes of the present investigation, scales from the three SDQ instruments called Reading self-concept (SDQ) and Verbal self-concept (SDQ II and SDQ III) are all called Verbal self-concept, even though items on the SDQ specifically refer to reading, whereas those on the SDQ II and SDQ III also include references to a broader array of verbal skills.