As mentioned earlier, one of the key settings you will select for each activity is the activity type. There are six different ways that activities can behave:
Start milestone
Finish milestone
Task dependent
Resource dependent
Level of Effort
WBS summary
A milestone represents an activity which has no time associated with it, though it can have costs and a resource assigned as responsible for noting this activity as completed. Use these in the case where an activity needs to report when it starts, not its progress or finish date.
An example start milestone would be the beginning of the construction phase of a project once all of the design phase has been completed. In this example, the start milestone serves as a placeholder that marks the end of one set of tasks and the beginning of another.
Another...