Paper on Value-Added

For the statistically astute:

Advantages of a Multivariate Longitudinal Approach to Educational ...
... Cary, NC: SAS Institute Inc. McCaffrey, DF, Lockwood, JR, Koretz, D., Louis, TA,
and Hamilton, L. (2004), “Models for Value- Added Modeling of Teacher Effects ...
http://www.wmich.edu/evalctr/create/2004/Wright-NEI04.pdf