A fundamental limitation of Critical Path Method (CPM) scheduling is its assumption of unlimited resources, meaning it does not account for resource constraints when calculating schedules.
* Option A (backward pass) is a standard part of the CPM process.
* Option C is incorrect as CPM considers activity dependencies.
* Option D refers to flexibility in diagramming methods, not a drawback.
The PSP Study Guide highlights resource constraints as a significant challenge in CPM application.