Final answer:
The statement that the main function of dummy activities is to clarify relationships in network diagrams is True.
Step-by-step explanation:
Dummy activities in network diagrams are used to clarify relationships between the actual tasks when there are complex dependencies. They are represented as dashed lines, have no duration or resources, and are crucial for understanding the project's critical path.
Dummy activities are used in project management, particularly within the context of network diagrams like the Program Evaluation and Review Technique (PERT) or the Critical Path Method (CPM). These activities are depicted as dashed lines connecting real tasks and do not have any time duration or resource allocation associated with them. Their sole purpose is to accurately represent the logical relationships between the actual tasks when there are complex dependencies that cannot be conveyed by simple connections.
Dummy activities are essentially placeholders that help prevent misinterpretation of the sequence of tasks and ensure that the project's critical path is understood correctly, which is essential for the project's timely and efficient completion. This clarification is particularly important when two or more tasks are both preceded and followed by the same activities, and it becomes necessary to show the dependency without implying that one of the tasks must be completed before the other can start.