Mexican and American children in grades 1 through 3 in urban schools were administered the McDaniel-Piers Young Children's Self Concept Scale to compare their self concept scores. Comparisons were made within three socioeconomic levels by grade level and sex for each item on the scale. In comparing the results, four generalizations were inferred: (1) American children are more concerned about the appropriateness of their feelings and behavior; (2) Mexican children are more frequently concerned with meeting their parents' expectations; (3) Mexican girls, by grade 3, have found a role marked by certain aspects of maturity and acceptance; and (4) American children who are poor may suffer more adverse effects on self concept than their Mexican counterparts. The forty test items are presented in English and in Spanish, followed by a paragraph summarizing the responses to the item. (MH