characteristics and extraneous effects on the class, like unobserved teacher quality. Boozer and Cacciola (2001) and Graham (2004 … 2001 and nine- and ten-year-olds in reading literacy. In the data, extensive information on home and school environment is … available through student, parent, teacher and school questionnaires. With 150,000 students tested, PIRLS 2001 is the first in …