Thumbs-up/thumbs-down, hand signals, online polls, and chat boxes have become the new mainstays of formative assessments in virtual classrooms. pic.twitter.com/E5QTOsGBIm

— edutopia (@edutopia) March 2, 2021

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more on formative assessment in this IMS blog
https://blog.stcloudstate.edu/ims?s=formative+assessment