The International Association for the Evaluation of Educational Achievement's (IEA) mission is to enhance knowledge about education systems worldwide, and to provide high-quality data that will support education reform and lead to better teaching and learning in schools. In pursuit of this aim, it conducts, and reports on, major studies of student…

Disruptive pupil behavior increased during teacher-initiated transition time as opposed to nontransitional time. Procedures for structuring transitions to increase time-on-task and maintain smoothness and momentum are described, and teachers' conceptions of time and classroom time flow are discussed. (Author/RD)