Systems of Systems, Viable System Model, and Soft Systems Methodology

Viable System Model
http://en.wikipedia.org/wiki/Viable_System_Model
 
Soft Systems Methodology
http://en.wikipedia.org/wiki/Soft_Systems_Methodology

Interesting discussion to Systems of Systems
http://www.linkedin.com/groupAnswers?viewQuestionAndAnswers=&discussionID=706264&gid=1327957&trk=add-qa-disc-0Ot79xs2RVr6JBpnsJt7dBpSBA