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Weaknesses of Jit

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4.1 Weaknesses of Toyota Production System (Just-in-time)

In additional to the strength of Just-in-time systems, there are a number of negative issues appended with its incorporation as well. "In just-in-time, everything is very interdependent. Everyone relies on everybody else" (Greenberg, 2002). One of the problem is the suppliers can't make quick response of the demand forecast and the changes in demand. In other words, the organization is unable to meet unexpected or surprised increase in order, since it has limited goods or no store up excess finish goods. In fact of not every supplier have the luxury materials. Therefore, there will have a big impact of the production process if the supplier failed to deliver goods to the company exactly on time. JIT manufacturing provides zero tolerance for mistakes, because it is very difficult to make the revision or in practice, as inventory to maintain in a tiny range.

As we mentioned before, it can cause roll "uphill" to the manufacturer if there appear shocks further down the supply chain. For an example, if the supplier of Toyota that provides vehicle seating have a big trouble or catastrophe requiring and forced to shut down the plant, then the JIT top of the chain manufacturer would be without seats till the supplier come back on-line or substitute another supplier. Therefore, it will lead to the JIT manufacturer face the problem either a slowdown or stoppage of production.
Apart of that, the largest shortcoming of JIT system are the streamlines or simplify the process and reduce any risky in the latest change, this is likely to be profitable. It is clearly know is inversely proportional between the risk and profitable, the lower the risk, which JIT basically eliminates because of the lack of uncertainty and that element of surprise and change, and it will has the less return that the organization may receive.

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