Dummy ActivityA dummy activity is a simulated activity of sorts, one that is of a zero duration and is created for the sole purpose of demonstrating a specificrelationship and path of action on the arrow diagramming method. Dummy activities are a useful tool to implement when the specificlogical relationshipbetween two particular activities on thearrow diagramming methodcannot specifically be linked or conceptualized through simple use of arrows going from one activity to another. In this case, the creation of a dummy activity, which serves essentially as a form of a placeholder, can provide exceedingly valuable. Dummy activities should in no cases be allocated any duration of time in the planning and/or scheduling or project activities and components. When they are illustrated in a graphical format, dummy activities should be represented by the user of a dashed line with an arrow head on one end, and may in some cases be represented by a unique color.