This study investigates whether adequate yearly progress (AYP) status, locale, and sector--common variables used to judge the quality of schools--accurately signal true differences in instructional practices in high school mathematics and science. Using data from the High School Longitudinal Study (HSLS), we find the school-to-school variation in…

This article analyzes a type of microcomputer program that can process a set of: (1) prior cases or incidents; (2) predictive criteria for separating the cases into two or more categories, and (3) relations between each prior case and criterion in order to arrive at an accurate decision rule. (Author/BS)