The BS 15000 standards have been superseded by the ISO 20000 series of standards in Dec 2005

ISO/IEC 20000-1:2005
Information technology -- Service management -- Part 1:
Specification

ISO/IEC 20000-1:2005 defines the requirements for a service provider to deliver managed services. It is based on BS 15000-1, which has been superseded in Dec 2005.

ISO/IEC 20000-1:2005 promotes the adoption of an integrated process approach to effectively deliver managed services to meet business and customer requirements. For an organization to function effectively it has to identify and manage numerous linked activities. Co-coordinated integration and implementation of the service management processes provides the ongoing control, better efficiency and opportunities for continual improvement.

Organizations require increasingly advanced facilities (at minimum cost) to meet their business needs. With the increasing dependencies in support services and the diverse range of technologies available, service providers can struggle to maintain high levels of customer service. Working reactively, they spend too little time planning, training, reviewing, investigating, and working with customers. The result is a failure to adopt structured, proactive working practices. Those same service providers are being asked for improved quality, lower costs, greater flexibility, and faster response to customers.