Abstract: Accordingly, one aspect of the present invention is to provide a system for multi-party project schedule collaboration, synchronization and execution in mega project operations across project and supporting supply chain networks. The system includes a plurality of remote computers in communication with a respective plurality of entities, a central server provided by a service provider over a network, a network interface in communication with the central server and the plurality of remote computers over a network, and a shared database in communication with the central server. The network interface being configured to receive one or more schedule updates via the network. The shared database a shared schedule having inter-shared relationships, one or more schedule tasks, a plurality of portions of the shared schedule and an execution plan to execute the shared schedule. Each of the one or more schedule updates includes a plurality of planned events impacting one or more of the plurality of portions.