Scheduling decisions in operations management can be arranged from long-term to short-term based on the planning horizon and level of detail involved:

• (D) Capacity Planning:
  🔹 This is a long-term decision, typically looking years ahead to ensure that sufficient capacity exists to meet future demand.

• (A) Aggregate Planning:
  🔹 A medium-term scheduling decision that translates capacity planning into a general plan for production, typically over 6–18 months.

• (C) Master Schedule:
  🔹 A short-to-medium-term schedule that breaks the aggregate plan into specific product-level schedules.

• (B) Short-term Scheduling:
  🔹 Involves day-to-day or minute-by-minute scheduling of tasks, people, or machines.