Abstract: An excess inventory system monitors excess material. In the system, requirements are determined for each component part over a predetermined period (e.g., 6 months) from material requirements planning (MRP) data. When forecasting for the component part is to be determined using an MRP planning method, the MRP data is used to determine a number of excess component parts. The number of excess components is then recorded in a record for the component part within an excess inventory table. When forecasting for the component part is to be determined using an alternate planning method which is alternate to MRP, the alternate planning method is used to determine a number of excess component parts. The number of excess components and a notation indicating the alternate planning method used are then recorded in the record for the component part within the excess inventory table.