Software projects often take longer as expected. Why?
See this great article by Michael Wolfe here!
Why are software development estimates regularly off by a factor of 2-3 times?
Map taken from bing.com/maps.
Michael explains the occuring (and unexpected) problems with an anology of a planned hike on the coast from San Francisco to Los Angeles to visit friends in Newport Beach.
The line is about 400 miles long; they can walk 4 miles per hour for 10 hours per day, so they'll be there in 10 days. Or...?