Provision of SIAM service (service integration and management) aligned to Government ICT strategy. Service will operate within a multi-sourced IT Tower environment. The SIAM service will provide clear and concise interfaces between the tower service providers, users of ICT services and the contracting organisation. The service will include; core service integration and management; service desk; IT information security support; service transition planning and support; service knowledge management, service/provider assurance; service validation and testing; transformation design and change services relating to SIAM/ tower service model.