Consider this statement:  When a teacher tries to teach something to the entire class at the same time, chances are, one-third of the kids already know it; one-third will get it; and the remaining third wont. So two-thirds of the children are wasting their time. Lillian Katz, EdD

Lillian Katz is a well-known leader in the field of early-childhood education. She lectures all over the world and has written numerous books and articles on elementary education, teacher education, and parenting. Like Tomlinson, Katz advocates for instruction that is differentiated to meet the needs of all learners. Consider her statement one-third/one-third/one-thirdthis is an estimate of what most teachers encounter when presenting new content.

What implications does this have for teachers when planning lessons?