production mgmt

Is there an optimal amount of preventive maintenance? What caution should be exercised before calculating this optimal amount? Your response should be at least 200 words in length. 

What are the goals, advantages, and disadvantages of JIT partnerships? Your response should be at least 200 words in length. 

1. Differentiate between a push and a pull system. Which system is most likely to reduce manufacturing cycle time, and why? What system can be used with suppliers, and what is the advantage? Your response should be at least 200 words in length.

A certain product has been effectively managed in the past, according to its managers. The previous technique used the economic production quantity model, and resulted in an optimum lot size of 100. For this product, setup time is directly proportional to setup cost, and setup time is currently 40 minutes per batch. How much must setup time decline in order for the lot size to fall to 50 units? 25 units? 10 units? Explain how you determined the declines in setup time you calculated. Your response should be at least 200 words in length.