What is the first important point / aspect you should be good at to show your expertise in operations / supply chain management?

Operations management for different industries differ and so does the priorities. In a general point of view the success of flawless operations depends on the coordination of the main key play factors- people, the objective of the business, resources at hand, and the most important one to get these to play and to "deliver to the right demanding party" with in the "time frame" which will lead to "Quality".