OneStream XF Projects usually have 3 components to it: Requirements, Design and Build. Requirements are received from the end users. Design is done by the consultants per the end users requests. Build is done by the consultants. Here is now they are implemented.
Once all of those are done, there will be a Go/No go decisions from the client. If they approve, they sign off, where the end users will sign saying OK. Then, the project will go live and be implemented.