Risk categories are potential causes of risk included in the Risk Management Plan for use during the Risk Identification and Risk Analysis processes. Risk categories are sometimes shown as a Risk Breakdown Structure (RBS). The RBS is a hierarchically organized depiction of the identified project risks arranged by risk category and subcategory that identifies the various areas and causes of potential risks. (1) Definitions of risk probability and impact - Agreeing on standard definitions helps to ensure that everyone is communicating on the same wavelength. Definitions are included in the Risk Management Plan for later use during Risk Analysis. (2) Probability and impact matrix - The probability and impact matrix assists in determining whether a risk is considered low, moderate, or high by combining the two dimensions of a risk: its probability of occurrence, and its impact on objectives if it occurs. (3) Revised stakeholder tolerances - As discussions become more specific during planning meetings about actual risks and actual costs, schedules, scope, objectives, and quality criteria, you will begin to get a better idea of your stakeholders' tolerance for risk than you had at the start of the process. (4) Reporting formats - Reporting formats depict the content and format of the risk register. The Risk Register is a document on which you will record identified risks and their characteristics. (5) Tracking - Tracking describes how and when risk information will be documented and reviewed for the benefit of current project, future needs, and lessons learned. Tracking also specifies whether risk management processes will be audited. (Nielsen, Risk Management Planning, February 5, 2007)