“A-O-N” network diagram has the activity information written in a small box that are the nodes of the diagram. The PDM technique is also referred to as “A-O-N” because it shows the activities in a node (box) with arrows showing dependencies. These relationships are drawn using precedence diagramming method (PDM). With A-O-A method, the detailed information about each activity is placed on arrow or as footnotes at the bottom.įigure 4.12 illustrates arrow diagramming method for concrete foundation work.Īctivities originating from a certain event cannot start until the activities terminating the same event have been completed. There are two kinds of network diagrams, the “activity-on-arrow” (A-O-A) network diagram and the “activity-on-node” (A-O-N) network diagram.Īrrow diagram or A-O-A is a diagramming method to represent the activities on arrows and connect them at nodes (circles) to show the dependencies. The event represents a point in time that indicates the completion of one or more activities and beginning of new ones. The direction of arrow specifies the order in which the events must occur. AND analyzes the sequences of tasks necessary to complete the project. In AND, each activity is represented by only one arrow in the network and is associated with an estimated time to perform the activity. It was adapted as an education tool for business managers. It was first used as a management tool for military projects. Reprinted with permission from Taylor & Francis Group.Īctivity network diagram (AND) is a graphical representation chart showing interrelationship among activities (task) associated with a project. Quality Tools for Managing Construction Projects. Used to break down or stratify ideas in progressively more detailed step. Used to choose one or two options that have important criteria from several options. Used to analyze the correlations between two or more groups of information.
Used to show logical relationship between ideas, process, cause, and effect. Interrelationship digraph (relations diagram) Used to organize a large group of items in smaller categories that are easier to understand and deal with. Used when scheduling or monitoring task is complex or lengthy and has schedule constraints.
Brief definition of these quality tools is as follows (values shown in the figures are indicative only).Īctivity network diagram (arrow diagram)/critical path method These tools are focused on managing and planning quality improvement activities. Seven management tools are most popular after classic quality tools.
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