This is a narrated slide presentation that reports on Dr. Lubienski's study of 7th-graders' experiences with a problem-centered curriculum, analyzing dependency on Socio-Economic Status (SES). Summary of Results: (1) “Higher SES students tended to display confidence and solve problems with an eye toward the intended mathematical ideas” (2) “Lower SES students preferred more external direction and sometimes approached problems in a way that caused them to miss the intended mathematical points”