Principles of lean:
1)customer value: measured by customer's willingness to pay, activity is able to transform goods/services, do it right the first time.
2)value-system analysis: find root cause to solve problems not symptom; 5Whys to identify root cause; tools - fishbone diagram, 80/20 chart; waste is identified (underutilization is also a waste).
3)everyday improvement: kaizen (individually and collectively); data is vital.
4)flow: is disrupted when one part of the system is not functioning; 5S process (sort, straighten, scrub, systematize, standardize)
5)pull: level scheduling practice; Kanban (take one, make one); 90% production and 10%maintenance
6)perfection: wastage and distraction sap creative energy, thus disable innovation; build in quality at the source; keep it simple.