In the text, “have been performed” (l.3) can be replaced by was performed.

More data are required to enable comparative analysis of doubtful factors which come together during project implementation and project evaluation results.

Past projects should play no role in setting up current sensitivity analysis for the new ones.

The use of sensitivity analysis allows project managers to understand precisely the uncertainty of substantial factors beforehand.

As to cost-effective results, public accountability can be taken for granted.

Sensitivity analysis methods determine a set of values of factors which if altered is liable to have crucial impact on the cost-effective results.

Project evaluation methods have succeeded in assessing the problems of uncertainty.

It is not easy to predict in a trustworthy way future result of a project.

During the last years, the difference between foreseen results and the real outcome has often been a problematic issue.

As far as project evaluation is concerned, it is useless to try evaluate uncertainty.