Issues of organisational behaviour in effort estimation for development projects

Factors affecting duration and effort estimation errors in software development projects

“…COnstructive COst MOdel (COCOMO), an expert opinion is required for selection of the proper input variables. External estimators provide consistently lower estimations than the developers themselves [22], and in many cases there is a gap between the estimators' perception of the required skill and the actual skill used in the project [5].…”