When T3 problems were predicted from measures of EC, 6 of 15 analyses were significant (and an additional analysis was nearly significant). Mother-, father-, and teacher-rated INTs, in comparison to EXTs, were predicted by higher attention and inhibitory control (especially the latter), and often findings were significant across reporters. Impulsivity was clearly related to T3 group status (for five of six effects). INT status was consistently predicted by low impulsivity, and the relations were often across reporters.