since the neighborhoods, while ethnically diverse, are relatively homogeneous economically.
The problem comes with the transition to middle school, where the kids from the low-income neighborhoods enter the mix. It is at this point that many of the middle-class families opt for private school.
http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2010/12/12/MNUP1GNRHS.DTLThe transition to middle school is a big one for families. In Oakland, students from a wide range of neighborhoods converge at city middle schools, which are larger than elementary schools, have less parental presence and are full of newly minted adolescents.
Students from neighborhoods riddled with violence and poverty sit next to middle- or upper-class kids with soccer moms and children of immigrants with strict codes of conduct.
While students leave Oakland schools at many grades, the greatest percentage of them make the change when it's time to move on to middle school, with rates far exceeding other urban districts. In San Francisco, about 12 percent of fifth-graders leave after elementary school.P.S. Also try the California forum.