8National Center for Education Statistics. How the NAEP Mathematics Assessment Works [DB/OL]. http: //nces. ed. gov/nationsreportcard/mathematics, 2007-07-15.
9National Center for Education Statistics. What Does the NAEP Mathematics Assessment Measure? [DB/OL]. http://nces.ed. gov/nationsrepor tcard/mathematics/ whatmeasure.asp. , 2007-07-15.
10Center for Innovation in Mathematics Teaching. Kassel Project [DB/OL]. http: //www. cimt. plymouth.ac.uk/project/ Kassel, 2007-07-15.
