Teachers using clocks or buzzers to ensure all students have the same amount of time.
To view a student attempting her first assessment. Note how in the last stage of her presentation she rushes to finish before the buzzer cuts her off, undermining her performance significantly.

Buzzers and rigid time limits are not necessary and may make students too stressed to perform their best. Some students may need more time because initially they are very hesitant; others may perform better if they can finish without any interruption or prompting. Teachers should use their own judgment to decide when they have sufficient assessable language.

To view a group of students voting for the Best Advertisement of the Year in 2010. Note how the students were not affected by the buzzer when it went off, and continued to the end of their discussion.