Just In Time, Lean, MRP

Identify and discuss some of the main elements of lean
thinking and just-in-time.

How can these concepts be used for effective planning and
control of an operation?

How are these two concepts (lean thinking and just-in-time)
different from the materials requirements planning (MRP) system?

How can these differences be overcome to achieve the
benefits of both lean thinking/ JIT and an MRP system?