Regarding viewpoints, it is a matter of definition of "completeness". In a world without any constraints we should aim for 110% completeness and have representation and surrogacy for all possible views... BUT we have to choose because we do have to deal with a rather large set of constraints, both project constraints (time, money and resources...) as well as legal stuff and "demanded requirements" etc ...
So we need a "scientific" way to prioritize and limit the viewpoints ... it is NOT easy!
This stakeholder managment skills (often uphold, explored and developed by a Business Analyst) involves soo much more than just a list of names and a communication strategy!
An "agile list of names" is NOT good enough...
Exploring, provoking, trawl and strategically "manipulating" to bring forward "that which can not be easily said or answered in a meeting" is a real skill that is not only about iterations. Iterations are only as strong as their inherent tranformational function!
We never see what is out there, we only see a representation of what we know, and that is a bottleneck for creativity and real change ...
