This document describes the TOPdesk Service Excellence Maturity Model, which provides a framework for measuring how well IT service departments meet customer expectations. The model has five levels that measure areas like people/culture, technology, processes, suppliers, and customers. Reaching higher levels means shifting from cost-focused to customer-centric and valuing customer experience. The document explains each dimension and provides examples of how organizations can use the model to identify improvement areas and work towards becoming a business partner through excellent customer-centric service delivery.