Just in time (JIT) systems are a popular inventory management model that relies on efficient scheduling and frequent deliveries to reduce waste and costs. In this system, products are only purchased and produced as needed, instead of stockpiling large amounts of inventory. This ensures that stock levels are kept up-to-date without having excess supplies cluttering the warehouse or taking up valuable shelf space. The emphasis is placed on delivering exactly what the customers require at just the right time to minimize delays and prevent any idle time during production. With JIT systems, companies can be more agile and respond quickly to changes in demand.