People receive input data by seeing or hearing them. These data are then stored in the brain, which also acts as a control and logic unit. The outputs from this type of information processing are oral or written reports and in some cases variety of physical actions. The human mind, acting as a control and logic unit, can perform many operations on data; adding, subtracting, multiplying and dividing, storing results, repeating the operations on different sets of data. Comparing to item outputting results in a prearranged manner.
The human mind is slow in performing the arithmetical computations required and is rather erratic in applying rules of logic. On the other hand, where judgment is required, the human mind is indispensable.