The SIAM Professional Body of Knowledge (BoK) expands the description of service integration and management (SIAM) from the previously released SIAM Foundation BoK.The Foundation BoK is recommended reading before using this publication.The contents of the SIAM Professional BoK are the source material for the EXIN/BCS Service Integration and Management Professional (SIAMTM) certification.This certification is aimed at professionals worldwide who have an interest in the practices of Service Integration and Management or want to apply or improve this methodology in an organization. The content of this certification is appropriate for customer organizations who will commission SIAM models, staff who provide retained capabilities in a customer organization, service integrators, and service providers working within a SIAM ecosystem.This certification includes the following topics: - The Discovery and Strategy stage; - The Plan and Build stage; - The Implement stage; - The Run and Improve stage; - SIAM practices across the stages.