In CMMI, “additions” are used to include material that may be of interest to particular users. For the CMMI for Development constellation, additional material was included to address IPPD.

The IPPD group of additions covers an IPPD approach that includes practices that help organizations achieve the timely collaboration of relevant stakeholders throughout the life of the product to satisfy customers’ needs, expectations, and requirements [DoD 1996]. When using processes that support an IPPD approach, you should integrate these processes with other processes in the organization. To support those using IPPD-related processes, the CMMI for Development constellation allows organizations to optionally select the IPPD group of additions.

When you select CMMI for Development +IPPD, you are selecting the CMMI for Development model plus all the IPPD additions. When you select CMMI for Development, you are selecting the model without the IPPD additions. In the text in Part One of this document, we may use “CMMI for Development” to refer to either of these models, for the sake of brevity.