The operations manager has a planning team that focuses on managing the inventory and planning the production of the operation. Planners must work closely with sales, manufacturing engineering and purchasing to ensure the operation has the proper amounts of materials to meet the demands of the forecast and customer orders. Investigate a successful and unsuccesful case study or example of where a company that used 3 or more different forecasting methods and what the reasoning was for using multiple forecasting methods. Be sure to discuss how the forecasting group worked with sales, engineering and purchasing.