Market hog inventories are currently collected by the National Agricultural Statistics Service (NASS) using weight groups. Cognitive work was done to determine if collecting the inventories by age groups would be easier and/or more accurate for producers. Focus groups and cognitive interviews were done in several hog producing states to get hog producers’ feedback on their preference for reporting market hog inventories. Producers were also asked for their opinions on the current weight group categories and proposed age group categories to determine if they are appropriate for the hog industry. There was an even mix across hog producers in this test who preferred age or weight. Given the lack of a strong preference among producers, it is recommended that inventories continue to be collected by weight groups.