The high school completion rate for the U.S. has increased only slightly over the last quarter of a century. A promising area of focus for dropout prevention efforts may be found in research that assesses how messages about educational attainment may affect school completion rates. The supportive communication framework is used to address how communication in the home and in school may affect student educational attainment. An extensive search of the student dropout literature was followed by standard meta-analytic procedures. The average weighted effect for communication in the home on high school completion was r=.21, and the effect for communication in school on high school completion was r=.14. The age of subjects and region of the country in which subjects lived were addressed as possible moderators of the relationship between communication in the home and school and educational attainment. No evidence that these variables moderated the relationship was found.