Each Montessori material isolates one concept or skill and the chaild is naturally drawn to work with it. A child can normally check his own work and this is termed a built-in “control of error”. The intention of the materials is not to keep the children dependent on these artificial lerning adis forever; they are used as tools to help children work and learn at there own pace, to see abstract ideas presented a very concrete, three- dimensional way, and to help them grasp and understand what they are working on. Montessori students iearn not to be afraid of making mistaes. They quickly find that few tings in life come easily and they can try again without fear of embarrassment.