This paper compares two functionally different approaches to analyzing standardized test data: least-squares based value-added analysis, geared principally to supporting teacher and school accountability; and Betebenner’s (2009) student growth percentiles, which focuses primarily on tracking...

This paper compares two leading approaches to analyzing standardized test data: leastsquares value-added analysis, used mainly to support accountability by identifying teacher and school effects; and Betebenner’s (2009) student growth percentiles method, which focuses on normative tracking of...