Additions are clearly marked model components that contain information of interest to particular users. An addition can be informative material, a specific practice, a specific goal, or an entire process area that extends the scope of a model or emphasizes a particular aspect of its use. In this document, all additions are related to the Service System Development process area.

The Service System Development process area is an addition. Another example of an addition is the reference in the Integrated Work Management process area that appears after specific practice 1.1, subpractice 6, “Conduct peer reviews of the defined process for the work.” The addition states “Refer to the Service System Development process area for more information about performing peer reviews.”