Check the blog post I´ve written for the ARIS Community blog (digital home of all ARIS and BPM geeks around the world) discussing the importance of modeling the social aspects of sofware processes.
We (this is a joint work with Eric Yu and Hesam Chiniforooshan ) believe this kind of knowledge is key to facilitate the adoption of a software process and, even more, to let software companies assess the chances of successfully enacting the process by checking (prior to process adoption) whether the social aspects of the process will be a good fit for the current team members structure and organization.
For more info on this you can read our paper: Adopting Agile Methods. Can Goal-Oriented Social Modeling Help?. 4th Int. Conf. on Research Challenges for Information Systems (RCIS10)