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At Level 3, a software development organization has a well-defined software engineering approach as well as a project management framework. Here, the processes are well documented and communicated across the organization through standards and training. Raynus says, "If the repeatable level defines what to do and who should do it, the defined level specifies when to do it and how to do it" [6].
Though Level 2 organizations are mostly concerned with project management processes, Level 3 organizations are, theoretically at least, also concerned with defining and measuring software development processes. This difference represents a major difference in quality.
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At Level 4, software development is increasingly managed using statistical methods. Both process and product quality measures are collected and monitored to quality controls. At Level 4, software products are not only managed to meet time and cost schedules, they are also managed to meet specific customer satisfaction and defect levels. Level 4 organizations understand and practice statistical quality control.