Due to its size and complexity, the InteGRail project has been divided into a number of Sub projects. Therefore, the general structure of the project is as follows:
SP1 – Project Management, Integration activities and horizontal Support (PMIS)
SP2 - System requirements, architecture and continuous assessment (SYS)
SP3A – Intelligent System Monitoring and Control (IMON)
SP3B - Intelligent System Maintenance (IMAIN)
SP3C - Intelligent System Management (ISMAN)
SP3D – Advanced System Communication (ICOM)
SP4 – System Integration, test and Validation (SIV)

The structure of InteGRail subprojects is summarised in the diagram.