A project manager is completing a project schedule network diagram using dummy activities to show all logical relationships. Which of the following tools is the project manager using?

The Activity Diagramming Method (ADM), also known as Arrow Diagramming Method, represents activities as arrows and nodes as events or milestones. Dummy activities, represented by dashed arrows, are a specific feature of ADM used to show logical dependencies without consuming time or resources, ensuring correct sequence when multiple activities converge or diverge from a single node.

WBS (Work Breakdown Structure) is a hierarchical decomposition of the total scope of work, not a method for drawing network diagrams with dummy activities.

AON (Activity-On-Node) is a network diagramming method where activities are represented by nodes, and arrows show dependencies, but it does not typically use dummy activities as ADM does.

PDM (Precedence Diagramming Method) is synonymous with AON (Activity-On-Node) and represents activities on nodes with arrows showing dependencies, also not utilizing dummy activities.