The first task in implementing ERP systems is to create a model of current business procedures and practices, which is called the as-is model. Managers and analysts then compare those as-is processes to the ERP process blueprints and note differences. The company then must find ways to eliminate the differences, either by changing the existing business process to match the ERP process or by altering the ERP system.
Once the differences between as-is processes and the blueprint have been reconciled, the next step is to implement the system. Before implementation starts, however, users must be trained on the new processes, procedures, and use of the ERP system's features and function. Additionally, the company needs to conduct a simulation test of the new system to identify problems. Then, the organization must convert its data, procedures, and personnel to the new ERP system. All of this happens while the business continues to run on the old system.