The document discusses different types of classroom time management and their importance for effective instruction. It describes four categories of classroom time:
1) Allocated time, which is the total time scheduled for class.
2) Instructional time, which is the time remaining after taking attendance and other routines.
3) Engaged time, which is when students are actively participating in learning activities.
4) Academic learning time (ALT), which is when students are successfully engaged in and learning from instructional activities. The document emphasizes that effective classroom management aims to maximize ALT.