The work of teaching and the challenge for teacher education

Here is a very interesting presentation held by Deborah L. Ball on a visit to Vanderbilt University. Ball has been in charge of several major projects concerning the teachers' knowledge of mathematics, e.g. the LMT (Learning Mathematics for Teaching) project, and she was also a member of the National Mathematics Advisory Panel, which delivered an important report earlier this year. (See one of my previous posts about this!)