Why do I see constraints on some of my tasks, even though I never set a constraint?
Microsoft Project sees any task with a “hard coded” date as a constrained task. This means that if you type in the start or finish date for a task, you are effectively setting a constraint on that task. This can be a problem if you have a delay in project that SHOULD cause a task to be rescheduled – because the constraint will prevent this from happening.
The solution is to avoid typing in dates! Use predecessors and successors instead.
For more power Project Management technique see our Project Management Tips.