Encouraging girls in math and science + halpern.

Title from title screen (viewed on Oct. 4, 2007). Report available online at http://ies.ed.gov/ncee/wwc/pdf/20072003.pdf. Includes bibliographical references (p. 41-47). "NCER 2007-2003." "September 2007." This report was prepared for the National Center for Education Research, Institute of Education Sciences, under contract no. ED-05-CO-0026.