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Despite compelling new knowledge about learning, how the brain works, and what constitutes effective classroom groupings, classrooms have changed little over the past 100 years. We still assume that children of a given age are enough like each other that they can and should traverse the same curriculum in the same fashion. Further, schools act as though all children should finish classroom tasks as near to the same moment as possible, and that school year should be the same length for all learners. To this end, teachers generally assess student content mastery via tests based on specific chapters of the adopted textbook and summative tests at the end of designated marking periods. Teachers use the same grading system for all children of a given age and grade, whatever their starting point at the beginning of the year, with grades providing little if any indication of whether individual students have grown since the previous grading period or the degree to which students' attitudes and habits of mind contributed to their success or stagnation. Toward the end of the school year, schools administer standardized tests on the premise that all students of a certain age should have reached an average level of performance on the prescribed content by the testing date. Teachers, students, and schools that achieve the desired level of performance are celebrated; those that do not perform as desired are reprimanded, without any regard to the backgrounds, opportunities, and support systems available to any of the parties. Curriculum often has been based on goals that require students to accumulate and retain a variety of facts or to practice skills that are far removed from any meaningful context. Drill-and-practice worksheets are still a prime educational technology, a legacy of behaviorism rooted firmly in the 1930s. Teachers still largely run "tight ship" classes and are likely to work harder and more actively than their students much of the time.
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Carol Ann Tomlinson (The Differentiated Classroom: Responding to the Needs of All Learners)