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I have been trying the think-pair-share technique in my undergraduate linear algebra class of about 30 students. Some students quite enjoy the experience. But I noticed that some other students simply use the time to check their cellphones or do what-ever they want.

I am picking a random student to share the answer now. But since we have a large class, it is unlikely that one is chosen. So many of them just take the chance and ignore the exercise.

Should I pick the students who clearly do not work on the problem instead?

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    $\begingroup$ Collect everyone's work without announcement, that may change the dynamic. $\endgroup$
    – James S. Cook
    Commented Feb 21, 2022 at 8:09
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    $\begingroup$ Do the students know each other, or are they complete strangers? Many answers in the linked question reference safety as a success factor in encouraging participation. Are you doing anything else to develop that atmosphere? $\endgroup$
    – Steve
    Commented Feb 21, 2022 at 12:35
  • $\begingroup$ They do know each other. Though a few students don't talk with any one. $\endgroup$
    – user11702
    Commented Feb 21, 2022 at 22:33
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    $\begingroup$ Forced groupwork does not work. Why American educators are so hung up on it is beyond me. $\endgroup$
    – Rusty Core
    Commented Feb 22, 2022 at 7:11

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