The transition comprised multiple different phases: • Project preparation: Conversion of business partners, organizational matters, preparation of technical aspects (Maintenance Planner, SI Check, Readiness Check), data cleansing, and archiving • Concept – sandbox: Sandbox development, concept, and customizing, conversion to sandbox, post-conversion activities, testing, workshops/training, customizing documentation, release of sandbox • Implementation – development/test system: Technical conversion, backup, transports from sandbox, check customizing, backup, finance conversion, testing and acceptance, post activities, function tests, and acceptance by specialist department • Implementation – production system: technical conversion, backup, transports from sandbox, check customizing, backup, conversion of finance, testing and acceptance, post activities, function tests, and acceptance by specialist department • Hypercare: Intensive support with issues and bugs