Little's Law, a foundational concept in operations management, helps quantify and evaluate the efficiency and effectiveness of a system by providing key performance indicators. By understanding the relationship between inventory, arrival rate, and cycle time, managers can make informed decisions regarding capacity planning. Little’s Law also serves as a diagnostic tool for process improvement initiatives and is particularly valuable in supply chain management, where it enables companies to optimize inventory levels, reduce lead times, and enhance coordination among various stages of the supply chain. It helps strike a balance between supply and demand, improving overall responsiveness and customer service.