1) Look at completed infographics and discuss what we like and what we think could be improved.
2) Have the students make a rubric for the infographic.
3) Have the students create infographics using http://infogr.am/
4) Share the infographics and discuss them as a class. Then choose which infographic is the best and why (which should go back to the rubric they created. That seems to be the most fair way, right?). Finally, I may even reward the best infographic-designer with homemade banana bread or something. ;-)
I think scaffolding the project like that would be an effective way to prepare learners and to make them aware of your expectations. Plus, this would employ a different kind of literacy that involves graphics and these new skills that are becoming more and more important in today’s world. When I try it, I'll let you know how it goes. If you try it before me, let us know how it went! (And share some tips, too, please!)