“…It also considers the task durations as random variables and the beta distribution as the appropriate one in order to model them. Other authors that presented research contributions on PERT are: Grubbs [17], MacCrimmon and Rayvec [28], Hartley and Northam [19], Moder and Rodgers [30], Parks and Ramsing [37], Ringer [39], Kotiah and Wallace [23], Britney [3], Sasieni [41], Farrum and Stanton [12], Gallanger [13], Golenko-Ginsburg [15] and [16], Moitra [32], Keefer and Verdini [21], Wayne and Cottrell [45], Lu [26].…”