replenishing days one day before or after the overstocked day. Routyn analyzes all factors and objectives, such as traveling costs, storage costs, investment costs, and interest rates. Through an integrated demand-driven optimization between the retailer's warehouse and its point of sale, Routyn assists the retailer in reducing its warehouse stock levels by posting orders to its suppliers in appropriate quantities. Routeyn combines demand forecasting with multi-day route planning optimization and cost optimization to provide retailers with an end-to-end decision support tool that minimizes costs and enhances service quality.