There are several main reasons:
1) model knowledge upgrade: Because the CMMI version will be upgraded regularly, the cycle is about once every 4 to 5 years. For example, the evaluation of CMMI-DEV V 1.3 stopped in March 2020, and now it is the transition stage from CMMI 1.2 to CMMI2.0, which has new knowledge points and requirements. With the change of the mode, it is necessary to invite professional consultants for corresponding training to better understand the change of CMMI mode.
2) Understanding of the model: When the enterprise first implemented CMMI, the first version mainly relied on the help of consultants, so it passed the evaluation smoothly. However, enterprises often do not have specialized personnel to conduct in-depth research on CMMI mode. Without the help of consultants, it is difficult for enterprises to prepare their own assessments. Even if the enterprise is prepared, there will often be insufficient or insufficient evidence, and there are certain risks in the evaluation. Consultants can check the preparation of the assessment to ensure that the evidence is sufficient and valid.
3) High turnover: IT companies have high turnover, so the training for new employees may not be timely and effective. Three years later, most of the employees who used to implement CMMI in the enterprise may have left, but the new employees have only a little knowledge of CMMI, let alone a deep understanding of CMMI mode, so the risk of preparing for CMMI re-evaluation by the enterprise itself is very great. With the help of consultants, employees can receive training and consultation to minimize risks.
4) Understanding of Chief Appraiser: Although the basis of CMMI evaluation is CMMI model, many appraisers have different understanding of the model, which depends on the appraisers' personal subjective judgment to some extent. The author has participated in dozens of appraisals and found that almost every appraiser has his own characteristics and concerns. Therefore, it is very important to find out the characteristics of the evaluator when evaluating. However, enterprises generally don't have appraiser resources and don't know much about appraisers, so it is very risky for enterprises to find appraisers to evaluate themselves. Generally speaking, when appraisers don't understand the implementation of CMMI in enterprises, they won't agree to make an evaluation. Because the consulting company has cooperated with the appraiser for a long time, it knows the appraiser very well and the appraiser trusts the consultant very much, so the consultant can find a suitable appraiser to evaluate the enterprise and ensure the smooth progress of the appraisal.
Wuhan Haodi Technology Development Co., Ltd. (trademark "Enterprise Certificate Easy") is a leading professional integrated solution provider in Central China, including information system construction and service capability assessment (CS), electronic and intelligent engineering contracting qualification, ITSS operation and maintenance assessment certification, CMMI assessment certification, information system security service qualification (CCRC), AAA credit rating registered by China People's Bank, ISO2700 1 and ISO20000.