Define "available to promise" (ATP) in supply chain context.

"Available to promise" (ATP) refers specifically to the uncommitted portion of a company's inventory that can be promised to customers. This metric is crucial for effective order management and customer service in the supply chain, as it allows companies to provide accurate information about product availability to their customers. ATP represents inventory that is not currently allocated to fulfill existing customer orders, thus giving businesses a clear picture of what is available for new sales.

This understanding is vital for planning and forecasting, allowing organizations to optimize inventory levels and avoid stockouts or excess inventory. When companies calculate ATP, they take into account all factors that might affect availability, such as production schedules, incoming shipments, and existing commitments to ensure that the information is robust and reliable for decision-making purposes.