Portfolio management is designed to assist in the definition, prioritization, approval and running of a set of projects within a given organization. These tools offer data capture, workflow and scenario planning functionality, which can help identify the optimum set of projects (from the full set of ideas) to take forward within a given budget. A CMM would not help determine the optimum portfolio of capital projects since it is a means of assessing the relative maturity of the IT processes within an organization: running from Level 0 (Incomplete—Processes are not implemented or fail to achieve their purpose) to Level 5 (Optimizing—Metrics are defined and measured, and continuous improvement techniques are in place). A configuration management database (which stores the configuration details for an organization's IT systems) is an important tool for IT service delivery and, in particular, change management. It may provide information that would influence the prioritization of projects, but is not designed for that purpose. PMBOK is a methodology for the management and delivery of projects. It offers no specific guidance or assistance in optimizing a project portfolio.