What signifies the 'pull' principle in Lean?

The 'pull' principle in Lean signifies a system where work is initiated based on actual demand rather than forecasted or anticipated demand. This approach ensures that resources and efforts are allocated efficiently, as work is only undertaken when there is a specific need for it. This reliance on current demand helps to minimize waste, as it avoids overproduction and the associated costs of managing excess inventory or unfinished tasks.

In a pull system, tasks are completed only when the next step in the value stream signals that it is ready to proceed, creating a smooth flow of work and ensuring that services or products are delivered in a timely manner based on customer needs. This method promotes responsiveness and adaptability, aligning closely with Lean principles focused on enhancing value and reducing waste throughout processes.