When a project lacks predefined organizational process assets (OPAs) related to risk categories, the risk manager can utilize the Work Breakdown Structure (WBS) to identify potential project risk categories. The WBS decomposes the project scope into manageable components, providing a hierarchical representation of all deliverables and work packages. By analyzing each element of the WBS, the risk manager can systematically identify areas where risks may arise, effectively categorizing them based on project activities and deliverables. This approach ensures a comprehensive assessment of potential risks across all aspects of the project, facilitating targeted risk management efforts.

PMI Risk Management Study Guide References:

The PMI-RMP Exam Preparation Study Guide notes that "the WBS serves as a foundational tool for risk identification, enabling project teams to systematically examine each component for potential risks and categorize them appropriately."