A risk breakdown structure (RBS) is one way of organizing the list of risks for a project. It can also serve as a way to brainstorm or communicate the risks. An RBS uses a tree diagram to show the sources, and categories of risk, and to organize them. (See figure 11-4 in the PMBOK, 5th edition, p. 317 for an example.)
Note: RBS also stands for resource breakdown structure.
Related: identify risks