The A-B-C inventory control technique is based on the classification of inventory items according to their annual consumption value.
The classification is as follows:
A items are the high-value items with low frequency of use (typically consuming a large part of total consumption value).
B items are medium-value items with moderate consumption.
C items are low-value items with high frequency of use.
Maximum attention is given to A items because these items contribute significantly to the overall consumption value and therefore have a greater impact on inventory costs.