he Time Horizon in Forecasting Short-term sales Product family sales Shift schedule Labor needs Resource requirements Resource requirements Days/Weeks Weeks/Months Short ermedo Long .The Short-term forecasting is required for day-to-day planning; Measured usually in day or weeks; Required for inventory management,production plan,and resource requirement planning,and shift schedulingThe Time Horizon in Forecasting Fig.2-1 Forecast Horizons in Operation Planning •The Short-term forecasting is required for day-to-day planning; •Measured usually in day or weeks; •Required for inventory management, production plan, and resource requirement planning, and shift scheduling