Little is known about factors other than students' abilities and background variables that shape teachers' achievement expectations. This study was aimed at investigating the role of teachers' perceptions of students attributes (working habits, popularity, self-confidence, student--teacher relationships, and classroom behavior) in shaping teachers' expectations. The sample analyzed consisted of 5316 students and 469 classes in grade 6 in Dutch primary education. Teachers had higher expectations for students who they perceived as self-confident and having positive work habits. Differences in expectations between boys and girls could partly be explained by the teachers' perceptions of students' work habits. Teachers differed in the extent to which they let their perceptions of student attributes shape their expectations.