Lean production principles are derived from the Japanese manufacturing industry and aim to eliminate waste through continuous improvement. The four main principles of lean manufacturing are: 1) Eliminating waste through just-in-time production and reducing inventory, defects, and unnecessary processes or motion; 2) Continuous improvement through small or large changes that enhance efficiency; 3) Respect for employees by communicating, recognizing good work, and listening to ideas; 4) Levelized production where the workload is steady each day using a pull system.