Every time I get into a conversation about education lately, someone drops a side-comment about Finland, like it's the Valhalla of public schooling. In the past few months, the success of Finnish students on international exams has been widely touted and press-ganged into the service of various arguments about what we do and don't need more of in America. Most notably, perhaps, in the documentary Waiting for "Superman", Davis Guggenheim cites Finland's success as proof that you can have a good public school system without spending any more money per pupil than we do currently.
I don't know much about the Finnish school system—I'm sure it's a good one—but to give teachers, schools, and school-systems the sole blame and credit for differences in test scores is one of the most common misuses of data in the study of education.