Evaluating project completion times when activity times are Weibull distributed

Activity networks have been used to model complex projects with wide applications in the field of production, planning and control. Stochastic activity networks (SANs) require a priori distribution function (d.f.) such as normal, exponential, Erland and others. In this paper, a development of the moments method based on Weibull distribution of activity time is presented. The method provides an accurate estimate of the project completion time compared with other d.f.'s estimates.