Teacher effectiveness research now informs the rationale of much Australian education policy aimed at redressing student under-achievement. The approach draws a "straight line" between teacher practice and student outcomes, "controlling" for and ultimately dismissive of other possible influences. The paper calls into question this conception of teaching-learning relations, particularly the extent to which teaching practice can be reasonably quantified and improvements in students' academic achievement can be solely attributed to and/or sole responsibility placed on the pedagogic strategies employed by teachers. Drawing on the theoretical resources of Foucault and Bourdieu, the paper argues further that teacher effectiveness research is flawed in both means and ends. It concludes that in its ranking of student and teacher performance, such research actually works against the purposes of education; specifically, authentic teaching and learning.