This is an easy-to-set-up and engaging activity for your students: They need to put their thinking caps on to try and figure out how the "puzzle pieces" fit together. That is to say, each student has a unique "Name Card" and must figure out who their two "group-mates" are. In doing so, students use and develop their discussion skills, critical thinking skills, and communication skills.
Teacher cuts up the set of thirty "name cards." Students are given one each, and then asked to get out of their seats, walk around, and talk to their classmates. Can they figure out who their group members are? (No two cards are the same; rather, they are thematically linked.) Some cards could fit with more than one group, depending upon the rationale, though only one arrangement has all thirty cards paired off nicely so there are ten groups of three.
Have fewer than 30 students? No problem. Remove some cards to create groups of two. Have more than 30 students? No problem. Have the remaining students be judges — they don't get a "Name Card," but instead, once a group of three students believe they have formed a group, the judges (aka inspectors) decree if the group is "Of the Norm" or is a "Blasphemy" (as is in keeping with the novel's Rigo's Inspectors). (You can let them deicide, or give them the Answer Key to keep things flowing more quickly.) The students have fun with this. In the end, the Inspectors themselves become a group of their own, for whatever next activity you have planned in your The Chrysalids unit.
I have used the same cards multiple times in the same class during The Chrysalids unit. Students end up getting different cards each time, and therefore must figure out who their partners are all over again. As such, I ended up laminating my cards to reuse them in the future, and save me valuable time from having to cut them out afresh each time.
I hope you find it as engaging as I have done with my students. Getting students out of their seats in a fun "detective work" activity is always a good thing! =)
You may be interested in the other resources I have created for The Chrysalids: