Activity-on-Arrow (AOA) represents an activity using an arrow of a particular length, thus allowing beginners to conceptualize and understand activity on the network easily. An AOA network can be relatively smoothly translated to a time-scaled network that helps users to understand the execution time of each activity schematically, by making the length of a narrow proportional to the duration of the activity.
However, the AOA method has a serious disadvantage in identifying and applying dummies. Depending on the network condition, a complex analysis may be required for applying dummies. Activity-on-Arrow is a dummy with zero time and no resource requirement; no actual work is performed in a dummy. Activity-on-Arrow (AOA) is a tool that can be used to create the intended work logically or to assign a task to a dummy.