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.
Carol Ann TomlinsonDifferentiated Instruction is a teaching philosophy based on the premise that teachers should adapt instruction to student differences. Rather than marching students through the curriculum lockstep, teachers should modify their instruction to meet students' varying readiness levels, learning preferences, and interests. Therefore, the teacher proactively plans a variety of ways to 'get it' and express learning.
Carol Ann TomlinsonImportant 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.
Carol Ann Tomlinson