Lean and JIT

In operations management, as in life, a balanced approach is often the best policy. One of the best examples of the benefits of this in operations management is the lean-approach. Explain the basic factors that must be in place to achieve a balanced lean system. Next, list three examples of unethical behavior involving lean operations, and state the relevant ethical principle that would be violated. Finally, contrast the push and pull methods of moving goods and materials through production systems. Please include cites and sources used.