What is a “Hard Problem”? There are of course many opinions on this subject and just like the concept of Beauty, it’s always in the eye of the beholder.
The best known and promoted definition of a Hard Problem is most likely the Defense Advanced Research Project Agency’s (DARPA) definition, which the Agency has promoted as “DARPA Hard”. The problem with DARPA’s definition is that it omits the commercial aspects of Quantifiability and Economicality, DARPA operates within a different financial constraints from commercial businesses.
