Differentiation is simply a teacher attending to the learning needs of a particular student or small groups of students, rather than teaching a class as though all individuals in it were basically alike.

I have little interest in a surgeon who says, "I learned that when I was in medical school. Why should I revisit it?" or who says, "I've done that operation the same way for ten years. Don't bother me with new approaches." I see teaching in the same way.

In my experience, professionals who are best in any field approach their work with humility. They know that their work is more than just a job. It's an exploration of life. Even on days when they feel most confident, things can go wrong. Sometimes even the good things that happen are a mystery - a surprise. There are always elements outside our control. That's humbling - or should be.

Important element is deeply understanding our curriculum. Most teachers know what they're going to cover this week or this term. Few of us can specify precisely what students should know, understand, and be able to do as a result of any particular learning experience or set of learning experiences. Without that specificity, alignment between content, assessment, and instruction is weak.

[Students] are also accustomed to having quick access to information. The idea of "storing" data in their heads can seem pointless. I find that they are also much more interested in learning through problem solving and group collaboration than in the past.

Plan to be better today, but don't ever plan to be finished

In the field of education, educators know that they leave a lasting impact on their students for better or for worse. Trust is established or diminished in the classroom and very good educators understand that they are fallible. Despite their best efforts, they will not always do the best for each student.