The TMMi Professsional syllabus states that students must have an understanding of how CMMI works to be able to understand the links with TMMi.
The CMMi model has both a staged and continuous representation model. The differences between them are are subtle but significant.
In the staged representation there are prescribed, ordered, stages that an organisation must go through to improve its development process (i.e. Maturity Levels). It is organisational maturity that is the focus of the staged representation. It provides a proven sequence of improvements that is a foundation for the next one and enables organisations to compare Maturity Levels by using a common rating.
In the continuous representation there are no fixed levels or stages to go through and organisations can select areas for improvement from different categories according to their perceived need. Process Area capability is the focus of the continuous representation. Using the continuous representation allows the selection of the order of improvement that best meets the organisational goals and addresses specific areas of risk. It also allows organisations to compare at Process Area level.
There are various reasons for selecting one or other of the representations. Some organisations may choose the one with which they are most familiar.
Benefits of the staged model
Benefits of the continuous model
The TMMi currently follows only a staged representation, but in the future there may be the option to use a continuous approach.