SAP GUI has become a legacy tool that does not receive new features in S/4HANA. The traditional SAP ECC interface has several drawbacks, such as its reliance on transaction codes, difficult navigation, and limited desktop use that is connected to on-premise systems. So, organizations looking to modernize need to switch to SAP Fiori. SAP Fiori offers a device-independent, role-based, cloud-ready user experience that simplifies processes and increases productivity. Its apps are made for specific business needs, guaranteeing effectiveness, uniformity, and user satisfaction on any device. Despite these benefits, research indicates that adopting Fiori has significant drawbacks, such as skill gaps, long-term GUI users’ resistance, architectural choices, and clean-core alignment during transformation initiatives. This study uses industry reports, comparative analysis, and documented organizational cases to examine the strategic, technical, and human-centered aspects of implementing SAP Fiori in S/4HANA transitions. In order to determine how Fiori affects productivity and system usability, the study examines how it has developed, assesses its design principles, and examines quantitative performance outcomes, like decreases in task completion time, error rates, and training effort. The study additionally highlights significant implementation guidelines for performance monitoring, extensibility options, phased deployment strategies, UX leadership, and continuous improvement after go-live. The results demonstrate that Fiori adoption is a strategic enabler of digital transformation, clean-core modernization, and intelligent enterprise readiness rather than just a UI improvement. In order to help practitioners, architects, and decision-makers successfully adopt Fiori and attain quantifiable business value during S/4HANA migration projects, the study offers a structured framework.

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