bout time / project management...

Why are software development task estimations regularly off by a factor of 2-3?
Is it the developer's fault? Is it a management issue? Bad methodology, or lack thereof? Or is it ingrained in the nature of the process?

http://www.quora.com/Engineering-Management/Why-are-software-development-task-estimations-regularly-off-by-a-factor-of-2-3
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