You should always be aware of what your Project Start Date is and be ready for the effect on your schedule.
If you change the Project Start Date using the Project Information dialog box (found under Task constraints often make linking tasks and setting successor start dates a little confusing.
When you specify date constraints, then the given task will have a calendar symbol in the Indicator column, as seen in Figure 6.
Figure 6 This constraint also affects your task links and successor start date. Task 24 has an SNET date of 11/26, and Task 23 (the predecessor) is linked to Task 24 (the successor) with a finish-to-start relationship.
One of the strengths of automated project management tools is their ability to apply some basic project management concepts.