Ever wondered what the big difference between Bloom's and Depth of Knowledge? How do I plan for rigor?
I just came a across a great article by Erik Francis, What Is Cognitive Rigor?
This is worth the read, he goes on to talk about not only the teaching and learning, but also questioning for cognitive rigor.
If you want to just know more about rigor with an eye on common core based standards, critical thinking and/or problem solving, this is a great resource for your notebook.