This article describes some of the conceptual and methodological issues that arise when researchers use teacher logs to measure classroom instruction. Data and examples come from the Study of Instructional Improvement, which used teacher logs to study patterns of literacy instruction in schools implementing three comprehensive school reforms. Over…

Explores problems involved in the quantitative verification of independent variables in investigations of the effects on student outcomes of planned variations in instructional behavior. Specifically addresses (1) gathering of data through direct systematic observation, and (2) analysis of those data through the use of inferential statistics. (GC)