1. Greenfield Implementation A fresh SAP system setup from scratch. Best for companies transitioning from legacy systems or new SAP customers. Involves business blueprinting, configuration, customization, testing, and go-live. Example: A manufacturing company implementing SAP S/4HANA PP for the first time. 2. Brownfield Implementation (System Conversion) Migrating from an existing SAP ERP system (like ECC) to SAP S/4HANA. Retains historical data, configurations, and business processes. Requires data migration, process adaptation, and system optimization. Example: An ECC 6.0 system moving to S/4HANA with minimal changes. 3. Hybrid Implementation (Selective Data Transition) A mix of Greenfield and Brownfield approaches. Allows selective data migration and process reengineering. Best for businesses that want to optimize existing processes while retaining some legacy configurations.