Argues that individual teacher's conceptions of disciplinary knowledge are reflected in the curricula but that institutional factors also influence the curriculum presented to students. Discusses constructivist epistemology and employs qualitative research to interpret teachers' conceptions in a case study of three biology teachers. Suggests…

One hundred and forty students in grades 6 and 7 were asked to process 32 science statements. Half of the statements were consistent with their prior knowledge, whereas the remaining facts were inconsistent with it. Half of the students were instructed to read the sentences for understanding (reading controls). The remaining students were…