Cold call sticks with student names on Popsicle sticks help me check for understanding randomly to gauge what individual students, what level of students, or whether the whole class is clicking with what I'm bringing. 

The clothespins are definitely a better tracking method than the sticky notes I have been using on my behavior chart. They can't fall off in one swift gust of wind and maker forget all about a student who may need a one-on-one talk or a call home!