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Line 13: \| title = A review of software surveys on software effort estimation \| url = http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1237981 }}</ref>. However, the measurement of estimation error is not unproblematic, see [[#Assessing and interpreting the_accuracy of effort estimates\|Assessing and interpreting ~~the_accuracy~~the accuracy of effort estimates]]. The strong over-confidence in the accuracy of the effort estimates is illustrated by the finding that, on average, if a software professional is 90% confident or “almost sure” to include the actual effort in a minimum-maximum interval, the observed frequency of including the actual effort is only 60-70% <ref>{{cite web \| author = Jørgensen, M. Teigen, K.H. Ribu, K.

Software development effort estimation: Difference between revisions