use Agile methods. Glossary definitions and model terminology were improved to enhance the clarity, accuracy, and usability of the model. Level 4 and 5 generic goals and practices were eliminated as well as capability levels 4 and 5 to appropriately focus high maturity on the achievement of business objectives, which is accomplished by applying capability level 1-3 to the high maturity process areas (Causal Analysis and Resolution, Quantitative Project Management, Organizational Performance Management, and Organizational Process Performance). For a more complete and detailed list of improvements, see http://www.sei.cmu.edu/cmmi/tools/cmmiv1-3/comparison.cfm. An overview of the changes is described in http://www.benlinders.com/2011/cmmi-v1-3-summing-up/. Process Areas, Categories, and Maturity Levels Table: Process Areas, Categories, and Maturity Levels References Official sources Capability Maturity Model Capability Maturity Model Integration Further reading Maturity models