About the UCM serial workflow for single-stream projects
In single-stream projects, your work as a software or information developer follows a serial flow.
To access your project source files, you set up work areas. To modify source files, you use activities to organize, identify, and complete your work. When you complete your work, your changes are immediately available to project team members. Unlike in multiple-stream projects, in single-stream projects, there is no delivery or rebasing.