1. Greenfield (Fresh Implementation) Start SAP from scratch No old system is used All processes are newly designed 👉 Best when company wants a completely new setup. 2. Brownfield (System Conversion) Upgrade existing SAP system Keep current data and processes Technical conversion (like ECC → S/4HANA) 👉 Best when company wants minimum change. 3. Bluefield (Selective Transformation) Mix of Greenfield + Brownfield Keep some data/processes, redesign others 👉 Best when company w