Here's one of my favorite excerpts from this Howard Gardner interview:
"If we all had exactly the same kind of mind and there was only one kind of intelligence, then we could teach everyone the same thing, in the same way, and assess them in the same way. That would be fair. But once we realize that different people have a very different kind of minds, different kinds of strengths - some people are good at thinking spatially, some people are good at thinking language, some people are very logical, other people need to do very hands-on things, actually explore actively, and try things out. Once we realize that then an education that treats everyone the same way is absolutely the most unfair education. Because it picks out one kind of mind which I call Law Professor Minds which are very linguistic and logical and if you think like that great - but if you don't think like that there's no room in the train for you."
This makes me think about how important both differentiated instruction and differentiated assessment truly are.