Which step involves ongoing refinement and enhancement in Lean?

The step that involves ongoing refinement and enhancement in Lean is "Seek perfection." This concept is fundamental to Lean principles, emphasizing the idea that processes should be continually improved upon to eliminate waste and enhance value delivery. Seeking perfection is not a one-time activity; it is an ongoing effort that encourages teams to constantly evaluate and refine their processes, seeking to achieve higher levels of efficiency, quality, and customer satisfaction.

By fostering a culture where everyone is involved in the pursuit of perfection, organizations can dynamically adapt and improve their operations, leading to sustained competitive advantage. This reflects the essence of Lean thinking, which is about continuous improvement and striving for excellence in all processes.

Mapping the value stream, creating flow, and identifying value are all important steps in the Lean methodology, but they primarily focus on understanding current processes and setting the stage for improvement rather than the ongoing refinement that the quest for perfection embodies.