Observations and student perceptions are recognised as important tools for examining teaching behaviour, but little is known about whether both perspectives share similar construct representations and how both perspectives link with student academic outcomes. The present study compared the construct representation of preservice teachers' teaching behaviour as perceived by trained teacher observers and students. It also examined the predictive power of both measures of teaching behaviour for student academic engagement. The theoretical framework of teaching behaviour used in this study is based on evidence-based research derived from empirical teacher effectiveness research. The study was part of a national project that included 2164 students and 108 teachers in The Netherlands. Results suggest that, although observations and student perceptions of teaching behaviour shared similar theoretical considerations, the construct representations seemed to differ to some extent. Furthermore, although both perspectives are significant predictors of student academic engagement, student perceptions appeared to be more predictive of their perceived academic engagement than observations. Implications for research on learning environments and teacher education are discussed.