The gradual and cumulative accomplishment of endeavors required by a company to finish a project is a "Workstream".
"Workstream Collaboration" is a way of working adopted by companies to achieve efficiency.
And within the types of projects that require collaboration, we could name: proposals, instructional manuals, and/or long reports, which are tasks hardly produced by just 1 person.
So, project collaboration converges resources and people from different backgrounds to accomplish a project throughout different boundaries such as corporate, departmental and national wide depending on the complexity of the project.