In the beginning, during process inventory, we identify business processes and use a high-level assessment of business impact and implementation effort to prioritize the process for further discovery activities. Next we create a Rough Order Magnitude (ROM) estimate in as little as a few hours, but typically after 2 - 3 days in a discovery workshop. The time required to finish a ROM estimate depends on the complexity of the process and the availability of knowledgeable process experts. We use the ROM estimate to write a business case to justify another 1 - 3 weeks of discovery activities to include additional documentation and deeper analysis of ‘as-is’ and ‘to-be’ process models.