A way of doing a card sort, thinking skills activity but without having to prepare any cards!
GROUP: Ask the students to think how they could sort the post-its into groups that have something in common. Do not suggest categories - the value lies in them making the connections themselves.
LABEL: Next they have to agree heading labels for their groups. For example, if climate change is the theme, some students might sort them into "Causes of climate change" and "Effects of climate change", or they may categorise them in a completely different way.
The really important thing from a thinking skills perspective is in eliciting and praising the connections that students make, and using thinking skills language, such as categorise, sort, classify, group, set, sub set, etc. when you plenarise the activity.