Service design addresses how services function and are presented to clients, aiming to ensure that client interfaces are useful, usable, and desirable from the client's perspective, as well as effective, efficient, and distinctive from the supplier's point of view. Service design produces understanding that influences organizations' strategies and tactics by understanding customer expectations so the organization can change how it operates to meet those expectations. The document provides an overview of key concepts in service design such as user-centered design, co-creation, sequencing of customer experiences, evidencing design processes, considering customer experiences holistically, and visualizing intangible services.