Signals can be used by students to indicate their understanding of the concept presented in a lesson.  The teacher can quickly scan the classroom and assess who understands the concept, who may need more help, and who does not have the idea at all.  The use of signals relies on two things:  the ability of students to assess their own understanding of the concept, and their willingness to be honest about where they are on the learning continuum.  The latter is fostered by a classroom climate where it is safe to say, "I don't understand." 

Fist to Five

Thumbs Up - Side - Down

Colored Cups


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