“…In calculating the determination of completion time, the following basic terminology is used (Banihashemi, et al, 2021): a) E (earliest event occurrence time), b) (latest event occurrence time), c) ES (earliest activity start time), d) EF (earliest activity finish time), e) LS (latest activity start time), f) LF (latest activity finish time), g) t (activity duration time). A project network diagram always begins with an event that indicates the start of the project and ends with an event that indicates the end of the project activity ( Pandiyan, et al, 2020). Each project can consist of several paths or paths from the initial event to the final even ( Dai, et al, 2020) Basically the network is a way of depicting project activities in the form of symbols ( Yu, et al, 2021).…”