Service Managers are responsible for managing ongoing services to clients, ensuring that the service meets contractual requirements and service level agreements. They also agree on service improvements with the client, based on service delivery realization and deviation. Senior Service Delivery Managers are responsible for the quality of service, managing and reporting on it, overseeing day-to-day operations, ensuring contractual commitments are met, proactively managing client relationships, and implementing continuous improvements. They work closely with others to plan client relationship strategies, focusing on cost reduction, service improvement, and new business.