Heppner, Witty, and Dixon's review of 2 decades of research on the Problem Solving Inventory (PSI) provides highlights of more than 120 studies relating problem-solving appraisal to psychological adjustment, physical health, coping, and educational and vocational issues. Although clearly an impressive body of literature, the level of data reported is uneven with attention to effect sizes (e.g., correlations) and sample descriptors (e.g., race/ethnicity, n size, gender). Acknowledging the importance of the PSI and this major review, we provide commentary on the need for a meta-analysis and the continual expansion of research on the PSI with respect to diversity issues (i.e., race/ethnicity, gender).