Using input and outcome data from a randomized study of dual-language immersion programs in an urban district, we examine the mediating relationships of dosage, expenditures, and classroom characteristics to students' academic performance, and the moderating role of students' race/ethnicity. Differential costs of immersion were concentrated at the…

The first section of this paper reviews research in which student achievement was not included as a correlate of principal attributes, or principal attributes were not included as correlates of student achievement. The second section focuses on the study of the linkage between the school principal and overall student achievement. (BW)

Several conceptions of schooling are outcome-bound: input-output models, school effectiveness models, classroom learning models, and systems theory models. Problems with each of these conceptions are identified, followed by a brief discussion of an outcome-free approach in which schools are viewed as cultural ecologies. (BW)