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According to the Software Engineering Institute SEI, , CMMI helps "integrate traditionally separate organizational functions, set process improvement goals and priorities, provide guidance for quality processes, and provide a point of reference for appraising current processes. In version 1. The staged representation is designed to provide a standard sequence of improvements, and can serve as a basis for comparing the maturity of different projects and organizations.
The model is divided into 4 categories, 12 capabilities and 25 process areas with initialisms in parenthesis, and highest maturity levels attainable in square brackets:. Depending on the areas of interest acquisition, services, development used, the process areas it contains will vary.
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CMMI best practices are published in documents called models, each of which addresses a different area of interest. Version 1. Trying to keep up with the industry the model also has explicit reference to agile aspects in some process areas.
An organization cannot be certified in CMMI; instead, an organization is appraised. Depending on the type of appraisal, the organization can be awarded a maturity level rating or a capability level achievement profile.
Many organizations find value in measuring their progress by conducting an appraisal. Appraisals are typically conducted for one or more of the following reasons:.
Of these, class A appraisal is the most formal and is the only one that can result in a level rating. Appraisal teams use a CMMI model and ARC-conformant appraisal method to guide their evaluation of the organization and their reporting of conclusions.
The appraisal results can then be used e. More modern approaches, that involve the deployment of commercially available, CMMI-compliant processes, can significantly reduce the time to achieve compliance.
Since the release of the CMMI, the median times to move from Level 1 to Level 2 is 5 months, with median movement to Level 3 another 21 months.
These statistics are updated and published every six months in a maturity profile.
To address user security concerns, two unofficial security guides are available. While they do not affect maturity or capability levels, these process areas can be reported in appraisal results.
The SEI published that 60 organizations measured increases of performance in the categories of cost, schedule, productivity, quality and customer satisfaction. However, the CMMI model mostly deals with what processes should be implemented, and not so much with how they can be implemented. These results do not guarantee that applying CMMI will increase performance in every organization.
A small company with few resources may be less likely to benefit from CMMI; this view is supported by the process maturity profile page Managed, while They believe neither way is the 'right' way to develop software, but that there are phases in a project where one of the two is better suited.
They suggest one should combine the different fragments of the methods into a new hybrid method. Sutherland et al. David J. Anderson gives hints on how to interpret CMMI in an agile manner . There are several CMMI roadmaps for the continuous representation, each with a specific set of improvement goals. For example, the XP requirements management approach, which relies on oral communication, was evaluated as not compliant with CMMI.
CMMI can be appraised using two different approaches: The staged approach yields appraisal results as one of five maturity levels. The continuous approach yields one of four capability levels.
The differences in these approaches are felt only in the appraisal; the best practices are equivalent and result in equivalent process improvement results. From Wikipedia, the free encyclopedia.
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