This commentary highlights convergent themes from four articles in the March 2009 issue of "Educational Researcher" on measuring classroom instruction. Classroom instruction is a complex enterprise that occurs at the intersection of teachers, students, and texts within the surrounding classroom, school, and community environments. Progress in…

Developed in this paper is a preliminary model of rationality designed to suggest what "applied" research should be like. The model is based on two ideas which are described and analyzed. One concerns epistemology in practical research, and the other discusses where problems come from in such research. (Author/EB)