Which of the following best describes a "Pull" in value stream mapping?

The concept of "Pull" in value stream mapping is best described as a system that produces based on customer demand. This means that production is initiated in response to actual consumption or orders from customers, rather than relying on forecasts or pushing products into the supply chain without confirming demand.

Implementing a pull system helps to minimize excess inventory and reduces the risk of overproduction, which are significant forms of waste identified in Lean principles. By aligning production with demand, organizations can respond more flexibly to customer needs, maintain optimal inventory levels, and enhance overall efficiency. This approach is foundational to Lean thinking, as it encourages a focus on delivering value directly aligned with what the customer truly requires at that moment.

In contrast, the other selections, such as building inventory ahead of demand or waste identification techniques, stand contrary to the concept of pull. These options refer to different approaches that do not effectively utilize the principles of Lean that aim to streamline production based on real-time customer demand.