"Why is it," writes noted assessment expert W. James Popham, "that today's educators seem almost compelled to replicate their predecessors' blunders?" Looking back over a career of more than fifty years in education, Popham identifies six key "unlearned lessons" in education and reflects on their impact on schools, teachers, and students. In an account enlivened by personal anecdotes and the unique perspective gained from long experience, he shows how each of these six mistakes has persisted over time, gives examples of encounters with these mistakes in the course of his professional career, and points the way toward straightforward solutions. This lucid and powerful book belongs on the bookshelf of anyone interested in the history of education and the intersection between assessment, policy, and instruction.