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 22 without making them wait for a long time and with out much effort. The cashier at the cash counter of a bank, a he transacts business, may be seen classifying and arranging the currency notes and coins separately according to their denominations. Such classifica tion and arrangement will be helpful to count easily and quickly large sums of money. The arrangement in a bangle shop will reveal that separate show cases are used to exhibit bangles made of different materials, viz., silver, ivory, copper, plastic, glass, porcelain, shell, etc. Even in those different cases bangles would be arranged according to their quality, colour and size. In a cloth shop, there may be two departments.. one for handloom goods and the other for mill-made goods. In each department, cotton, wool and silk clothing would be arranged separately. Further, these clothing may be so arranged as to exhibit men's clothing in one place nd women's othing in another place. From the above illustrations, it will be clear that classification and arrangement are done for various reasons. The housewife wants to minimise her movements in the kitchen by arranging the articles within her reach. The vendors in the vegetable markets want to transact more business and hence they dislike the customers being made to wait for a long time in their shops. The cloth mer- chant wishes to satisfy all his customers. The cashier at the cash counter of a bank, does not want to take a longer time to transact business and to