The validity and utility of a dual-factor system (DFS) of mentalhealth was explored. Factors were the traditional perspective onmental health, psychopathology (PTH), and the more recentperspective, subjective well-being (SWB). Research has shown thatPTH and SWB are not simply opposite poles of a single continuum,however, the constructs have yet to be integrated.The sample consisted of 407 children in Grades 3–6. Subjects wereclassified as high or low on each construct, offering fourresearch groups, two challenging the unidimensional perspective.Group membership was the classification variable in a series ofdiscriminant function analyses. Predictors assessed the domainsof temperament, personality, self-concept, locus of control, andinterpersonal relations.Results offered strong initial evidence for the validity andpotential utility of a DFS. Results are discussed, as areimplications for mental illness prevention/intervention.