In the context of Lean , sequential pull is a materials management system where production of items is triggered by the actual demand of a downstream process, as opposed to a push system where production is driven by a predetermined schedule.

In sequential pull, the materials or products are pulled through the process in a fixed order (sequentially). The downstream process asks for a specific item, and this signal triggers the upstream step to produce that specific item. This process repeats itself throughout the value stream.

The key to the success of sequential pull is the ability to synchronize production with actual demand, leading to:

• Less waste: Overproduction is avoided, as only what is actually needed is produced.
• Lower inventory levels: Fewer buffers are needed, leading to less storage space and capital tied up in inventory.
• Shorter lead times: The product moves smoothly through the process without unnecessary waiting times.

A good example of a sequential pull system is a conveyor belt on which cars are assembled in a specific, predetermined order (sequence), with each work station sending a signal to the previous station to deliver the next part.

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