Authors:

Because one has to be an optimist to begin an ambitious project, it is not surprising that underestimation of completion time is the norm.

"On Building Systems That Will Fail". Communications of the ACM, Volume 34 Issue 9, dl.acm.org. September 1991.
Because one has to be an optimist to begin an ambitious project, it is not surprising that underestimation of completion time is the norm.