Why we need schedule projects?

There are different parties involved in any project. They all need benefits from project scheduling.

For constractors:
1 calculate the project completion date.
2 calculate the start or end of a specific activity
3 coordinate among trades and subcontractors, and expose and adjust conflicts.
4 predict and calculate hte cash flow
5 improve work efficiency
6 serve as an effective project control tool
7 evaluate the effect of changes
8 prove delay claims  （critical path method)

For project owners and developers need project scheduling to:

1 get an ideas on project's expected finish date
2 ensure sontractor's proper planning for timely finish
3 predict and calculate the cash flow
4 serve as an sffective project monitoring tool
5 evaluate the effect of chages
6 varify delay claims