(1) What is the difference between preventive, breakdown, and predictive maintenance? What are some important problems that usually appear in relation to maintenance and reliability policy?

(2) Reverse logistic is becoming very important, especially in the world of e-commerce. However, it also brings a lot of significant challenges, particularly for local SMEs post-covid. Explain.

(3) What is the purpose of aggregate planning? Describe some demand and capacity options for implementing plans. How does it relate with MRP, production planning, and scheduling? Provide examples if deemed necessary.

(4) The terms lean manufacturing, just-in-time (JIT), and Toyota Production System (TPS) are often used as if they are the same thing, but they are actually not identical concepts. Do you agree with that statement? Discuss.