Cumulative ATP without lookahead takes into account what factors?

The notion of Cumulative Available-to-Promise (ATP) without lookahead is fundamentally concerned with assessing inventory availability over time in relation to customer demand. When considering this definition, it becomes clear that unused Master Production Schedule (MPS) amounts from previous periods play a significant role.

Cumulative ATP incorporates not only the current MPS amounts but, importantly, it accounts for any unused MPS amounts from prior periods. This is essential because unallocated production from previous schedules can effectively enhance the available inventory for fulfilling incoming orders. Therefore, by including these unused MPS amounts, businesses can make more informed decisions about how much inventory is genuinely available to satisfy customer orders, particularly when current MPS amounts may not be sufficient alone.

In contrast, focusing solely on current MPS amounts disregards the previous scheduling history that could provide critical insights into inventory availability. Similarly, emphasizing only current customer orders or future production plans does not account for the real-time impact of past unused production capacity. Hence, considering unused MPS amounts from previous periods enables a comprehensive understanding of cumulative ATP without lookahead.