Sensitive Periods are durations of time during which the intensity of interest in specific objects in the environment is at its peak. The sensitivity and responsiveness to a particular stimuli declines with time. These periods indicate the opening of increased developmental opportunity.
Arithmetic is the knowledge of numbers and associated processes such as addition and subtraction, which is intuitively learned at early stages of childhood and developed gradually, through repetitive exercises, observation and experience. It helps the mind to distinguish and relate objects by means of symbols and ideas such as shape, space, identity, difference and quantity. For example, a child learns gradation in numbers, such as 1,2,3,4, and recognizes them as distinctive entities by adding or subtracting identical units.
In contrast to the older teaching systems, The Teacher describes a new method or system of teaching, which values teacher as a guide or connecting link between objects and the student. This system does not rely on objects as a help to teacher, but as a help to student himself with assistance of the teacher. The role of teacher has been modified from an active corrector of mistakes to a more rigorous but patient guide, who acquaints herself with knowledge of objects and then guides students in using those objects on their own, while prefecting learning and maintaining order in the environment. The teacher should be prudent enough to facilitate needs of both the more and less developed minds at the same time.
Development of Mind describes the psychological self-construction in children while interacting with their environment. It is a continuous process which begins when new sensitivities appear and gradually fade until new ones emerge, and helps in orderly intellectual development through time. For example, the ability to of mind to choose without conscious intent indicates development.