Foundation (FND) is the module that provides shared services consumed by every other module in the platform. It owns no business domain of its own; instead it supplies the infrastructure and starter data that domain modules depend on.
The PPM data model is built around four core concepts — Projects, Work Items, Milestones, and Baselines — with work items connected to each other through parent–child hierarchy, links, and dependencies. Understanding how these relate is the key to understanding how Raytio's project tracking works.
A Project is the top-level organisational unit in the PPM module. Work items can be grouped under a project, though this is optional — standalone and cross-project work items are also supported. Each project carries its own metadata, membership, and configuration.