21st century learning - curricular design.

A lesson that I implemented I think, actually, contained all 4 of the components of 21st century learning:
Students were to, the day prior to the debate, get into small groups of 2-3 that would take a side: "who would be a better leader for the Roman Republic - Brutus or Antony?" They'd compile evidence and opinions based on the speeches and soliloquies given in the play The Tragedy of Julius Caesar by William Shakespeare. Then, the next day, they'd get with all of the others that took their position and prepare a debate. Then, they give opening arguments referencing a. rhetorical devices used; b. direct quotations, and c. citing examples of creating Logos, Pathos, or Ethos, with reference to the Aristotelian triangle of rhetoric, and the positives of each of the points in turn. Then, they rebut the opposition. Lastly, they offer closing arguments. Here's why the 4 tines of 21st century learning were used:
Critical Thinking - well, there was a lot of it! Synthesizing that much rhetoric, logical appeals, and then parsing others' arguments looking for logical fallacies is an in-depth job, and requires much logic of the play, motivations of the characters, and rhetoric.
Creativity - While this is probably the least-implemented, coming up with reasons that the other side is wrong while not sounding snarky or belligerent is not a skill that is highly-developed in sophomores - so it's creative for them, if they succeed.
Collaboration - they must work well as a group, both in the research and presentation of their arguments.
Communication - see above!

The results of the controversy were: a good debate, engaged students with regard to Shakespeare (accomplishment!), engaged brains, and outraged students (see: losing side!). Everyone got a jolly rancher, though.
I learned that debate is awesome. Actually, I already knew that. But still!