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SAP Activate is a methodology. It lays down, logically, the roadmap to follow when executing an SAP implementation - from the project scope to going live.
SAP Fit-to-standard is a mindset. It focuses on developing an attitude that requires us to look at what is available before creating something from scratch. A ready solution that meets 98% of your requirements is better than investing efforts in creating a new solution.
SAP Activate and Fit-to-standard are closely interlinked. While SAP Activate is the methodology used in the deployment, upgrade or migration to S/4HANA, SAP Fit-to-standard is an approach that expedites the implementation approach of S/4HANA.
Before we discuss SAP Fit-to-standard, here is a quick recap of SAP Activate -
In simple terms, it is a ready DIY manual on running and deploying any S/4HANA landscape - on the cloud, on-prem or even a hybrid environment.
SAP Activate has always been the playbook for project managers and technical and functional teams looking to manage the implementation or migration to S/4HANA, covering the deployment, upgrades, and migration to SAP S/4HANA.
SAP Activate = SAP Best Practices + Guided Configuration + Methodology.