A schematic display of the sequential and logical relationship of the activities which comprise the project. Two popular drawing conventions or notations for scheduling are arrow and precedence diagramming.
(Wideman Comparative Glossary of Common Project Management Terms v2.1)

Other Definitions

Network Diagram – A view of project data in which the project logic is the sole determinant of the placements of the activities in the drawing. Frequently called a flowchart, PERT chart, logic drawing or logic diagram.
(Wideman Comparative Glossary of Common Project Management Terms v2.1)

Network Diagram – A graphic representation of activity sequence and relationships. Activity boxes are connected together with one-way arrows to indicate precedence. The first activity is placed on the left side of the diagram with the last activity on the right side. Activity boxes are usually placed at different levels (not in a single row) to accommodate activities that are done simultaneously.
(Wideman Comparative Glossary of Common Project Management Terms v2.1

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J. Jerrald Hayes
I am ex-architectural woodworker and general contractor turned IT, Business and Project Management consultant, software developer wannabe senior division triathlete and ski racer, Yankee fan and founder of Paradigm-360.com, 360 Difference Mac4Construction.com,iOS4Construction.com and now TheBuildingAndRemodelingWiki.com too.
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