Over the years, ITIL has worked on many changes that have impacted the relationship between service providers and various support providers, whether internal IT organizations or external service providers. As business and technology continue to evolve at a rapid pace, it is increasingly important to establish good practices to enable the definition, design, implementation operations and improvement of services, providing management control and management while maintaining the flexibility required to meet new and changed requirements. ITIL's books represent the learning and experience of many customer service organizations, and the core theme of continuous service improvement is to develop not only best practices but also increase quality and efficiency in the service management industry. ITIL regards service providers of all sizes, whether in the public or private sector, providing a vendor with an impartial framework that can be adapted and tailored to the needs of the organization and its customers. In an industry where procurement strategies can be diverse and complex, ITIL provides a common language and set of processes that enable the continuous and integrated delivery of end services. Thanks to the best practice, ITIL delivers the best business results for the invested resources. Changing business priorities, economic challenges, commercial pressures, and new technologies will continue to shape the market. The guidance provided in the ITIL publications provides a proven framework of best practice to enhance an organization’s capability to deliver maximum value to the business.