The Curriculum Developers at TCI have incorporated recent scholarship not readily available to all teachers. For example, activities for middle school include more steps to understanding a concept than do activities for high school. For example, to use middle school units at the high school level, a teacher might include more reading and require longer and more complex written responses. To use high school units at the middle school level, teachers might simplify reading materials and teach new or difficult concepts and content in smaller increments. The amount of time spent on a unit depends on many factors, which include class size, length of class period, and teacher background.
Most units provide at least six weeks of teaching material.
Teachers do not need to teach every activity in a unit. America's Past, does have color overhead transparencies because we are aware that overhead projectors are common in classrooms and that slide projectors are increasingly difficult to buy. When we began to develop units several years ago, slides were the best option. The image quality and durability of transparencies were not as good as they are today. As we revise our older materials, we will replace slides with color transparencies.