Finish-to-Start (FS): one activity cannot start until the other ends for example, activity A cannot start until activity B is finished.Finish-To-Finish (FF): one activity cannot finish until the predecessor activity is finished for example, activity A must be finished before activity B can be finished.Incorporate all four activity dependency types.Project Management Institute (PMI) defines the precedence diagram as: “A technique used for constructing a schedule model in which activities are represented by nodes and are graphically linked by one or more logical relationships to show the sequence in which the activities are to be performed.”Īn Activity on Node Diagram, also known as the Precedence Diagram Method (PDM), lacks the limitation of the arrow diagram. The preferred and most common network diagram tool is the Activity on Node or precedence diagram. Schedule Network Diagram Type 2: Activity on Node / Precedence Diagram Method (PDM) However, as an arrow diagram may appear in limited use in some businesses, they are a potential topic in PMP certification exam questions. The limitations of the activity on arrow diagram led to its limited use in project management. ADM can only show “finish-to-start” (FS) relations among activities. The arrow length represents the activity duration. Schedule Network Diagram Type 1: Activity on Arrow / Arrow Diagram / Arrow Diagram Method (ADM)Īctivity on arrow uses arrows to represent project activities: the end of the arrow is the activity start and connects to a node (box), and the head (the pointed end) is the activity end that connects to a node (box). Therefore, as the activity on node diagram is more detailed, it is typically used during a project’s planning phase but can also be used during the execution phase. An activity on arrow diagram shows the logical relationships between activities, while an activity on node diagram also includes the duration of each activity. Project schedule network diagrams are “Activity on Arrow” or “Activity on Node.” The main difference between an “activity on arrow” diagram and an “activity on node” diagram is the level of detail. This list is not exhaustive but addresses the core terms and concepts within project network diagrams. Successor: an activity that must happen after a previous activity concludes.Predecessor: an activity that must happen before another can begin.Lead: the amount of time an activity can be accelerated in relation to a preceding activity.Lag: the amount of time needed between two dependent activities.Float: the amount of time an activity can be delayed without affecting a successor activity (free float) or the amount of time an activity can be delayed without affecting the project end date (total float).Critical Path: the longest sequence of activities that must be completed for the project to be finished on time.Arrows: graphical representation of activity connection, sequence, and interdependency.Activity Dependency: relationships among activities that shape the sequence in which the activities can be started and must be completed within the overall schedule.Project Network Diagram TermsĪ project schedule network diagram requires understanding key terms and applying them to the network diagram. Additionally, the project manager uses the project network diagram to communicate progress against the planned project schedule. serve as a tool to communicate schedule progress and issues.įor example, Project Managers use a project network diagram to identify the critical path and float for the project to understand the overall project schedule better.
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