1- Use pert technique for estimate duration for fourth schedule. 2- use all schedules to make critical path with network diagrams so you have to use optimistic pessimistic & most likely & estimated...

1- Use pert technique for estimate duration for fourth schedule. 2- use all schedules to make critical path with network diagrams so you have to use optimistic pessimistic & most likely & estimated duration ( what you found with pert) 3- Work breakdown structure by breaking down the every activity according to the attached case study project. You have to make all the things on project libre or microsoft project i am attaching the case study please go through it. use any good template for making work breakdown structure. you have to make all four different work breakdown structure for every schedule. & lastly analyse which one is the best & analyse difference between every schedule & analyse all critical path from every schedule ( which is the best). ( FOUR DIFFERENT GANT CHARTS SHOULD ALSO BE THERE) & Pert formula is = optimistic time + 4* mostlikely + Pessimistic / 6 i am attaching a copy of case study as well. please go through