Two Bin Techniques : One of the oldest systems of inventory control is the two bin system, which is mainly adopted to control C group inventories. In the two bin system stock of each item is separated into two bins. One bin contains stock just enough to last from the date a new order is placed until it is received in inventory. The other bin contains a quantity of stock is enough to satisfy probable demand during the period of replenishment. To start with the stock is issued from the first bin. When the first bin is empty, an order for replenishment is placed and the stock in the second bin is utilized the ordered material is received.
Such a method is appropriate to ideal conditions in which the rate of consumption is fairly constant and for items the lead time of which is fairly established and regular.
Although the systems itself possesses a high degree of automacy, in practice we need to allow for variations in the rate of consumption as well as lead time. However for such a system the most desirable quantity to re order is the EOQ. Since the quantity to re order is fixed in advance it action of replenishment action can be delegated to the lower level staff and there i s need to take physical count of inventory also.
A possible disadvantage of the system is the requirement of additional storage facilities and perhaps some practical difficulty in keeping the two stocks properly separated.