Caterpillar is a manufacturer of heavy machinery that is sold through its network of dealers around the world. A popular Caterpillar product is the skid steer loader, which is commonly used in general construction, agriculture, and landscaping. Segmenting Caterpillar$$s skid steer loader customers by industry enables it to better satisfy customer needs by matching its product and available attachments to the industry focus of the customer. Caterpillar is using $\_\_\_\_\_\_\_$ as a segmentation variable.