Three Point Technique to Estimate Task Duration, Es-Ef,...

The total duration of the construction project by adding the estimated task duration serially would give us 70 weeks. But some tasks within some activities can be done in parallel sequence or simultaneously, which would significantly reduce the construction project completion time using the critical path method (CPM). In this method the longest path is the critical path which runs through one of the route in the project network diagram from start to finish. This project network diagram is illustrated on the printed assignment page, we have 10 tasks listed from A to J. Below is an activity list of the tasks; ACTIVITY | ACTIVITY DESCRIPTION | IMMEDIATE PREDECESSORS | ESTIMATED DURATION (WEEKS) | A | Clearing the vacant lot | none | 7 |†¦show more content†¦1(B) II. The completion time for the project would slightly increase adding the 3 weeks delay of task B to the 70 weeks estimated time for the project to 73 weeks, while the earliest finish time using the critical path method (CPM) the task duration estimates for the project completion would increase from 39 weeks to 41 weeks. CRITICAL PATH TASKS | PATH LENTHS IN WEEKS | 1. start: A-B-E-H-J- finish | 7 + 14+ 11+ 2+ 8 = 33 | 2. start: A-B-F-H-J- finish | 7 + 14+ 10+2+8 = 41 | 3. start: A-C-G-H-J- finish | 7 + 12+ 3+ 2+ 8 = 32 | 4:start: A-C-F-H-J- finish | 7+ 12+ 10+ 2+8 = 39 | 5: start: A-D-H-J- finish | 7 + 9+2 + 8 = 26 | 6:start: A-D-I-J- finish | 7+ 9+ 6+ 8 = 30 | Figure 1.4 The expected project completion time using the critical path method would increase to 41 weeks. 1. (B) III. If all the tasks are delayed by 1 week each, there would be additional increase from 70 weeks to 80 weeks because we have 10 task activities, but the earliest completion time would be 44 weeks using the critical path method (CPM). CRITICAL PATH TASKS | PATH LENTHS IN WEEKS | 1. start: A-B-E-H-J- finish