Zara uses IT systems like POS and PDAs to gather real-time customer data on fashion trends. Designers use this data to quickly design and produce new clothing collections, with over 12,000 new items produced each year. Zara's supply chain is highly responsive, allowing new items to go from design to stores in just 15 days. This fast fashion model allows Zara to have minimal inventory and avoid markdowns. In contrast, competitors like Gap rely on long lead times and large production runs, leading to higher risks of unsold inventory.