Mr. Mark Schenk provides a good overview of various types of problems in this video.
Access it:
http://youtu.be/WUJviaTi7VA
What is clear is that complex problems require an approach that is different.
The Weston Group has adopted The Unicist Standard for addressing issues with complex problems or adaptive systems.
There are many reasons for this which are based on the fundamentals of the Unicist approach and manifest in Unicist Business Architecture. These can be found at: http://www.unicist.net
I personally invite everyone to join in using the best technology in the world for creating real results when the problems are complex.