The lean production line, also known as the lean cell line, the flexible production line, and the 3.0 cell line, is a production method that eliminates waste and uninterrupted work processes rather than batch and queue. The lean production line is a management philosophy derived from Toyota's production methods. Lean is best known for focusing on reducing the seven wastes from Toyota to improve overall customer value, but there is no final conclusion as to which is the best way to achieve this goal. Toyota Motor Corporation has grown steadily from a small company to become the world's largest automaker, focusing on how to achieve this goal.

A lean production line should be designed from the specific needs of customers, combined with lean ideas and methods to design lean and lean production lines. The clear purpose from start to finish is to eliminate or push waste in the production line to maximize the efficiency of the production line. Lean production lines result in less waste, greater flexibility, more balance, and streamlined product flow.