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"A project network is a graph (flow chart) depicting the sequence in which a project's terminal elements are to be completed by showing terminal elements and their dependencies.
... the project network shows the "before-after" relations.
The most popular form of project network is activity on node, the other one is activity on arrow.
The condition for a valid project network is that it doesn't contain any circular references." [Project network. Wikipedia]
The PERT chart example "Project management plan" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the solution "Seven Management and Planning Tools" from the Management area of ConceptDraw Solution Park.
PERT
PERT, time interval, task, project start, project finish, PERT,
Legend
Legend, legend,

seven management and planning tools Seven Management and Planning Tools

seven management and planning tools
Seven Management and Planning Tools solution extends ConceptDraw PRO and ConceptDraw MINDMAP with features, templates, samples and libraries of vector stencils for drawing management mind maps and diagrams.

management diagram, management mind map Management Area

management diagram, management mind map
The solutions from Management area of ConceptDraw Solution Park collect templates, samples and libraries of vector stencils for drawing the management diagrams and mind maps.

ConceptDraw Solution Park ConceptDraw Solution Park

ConceptDraw Solution Park
ConceptDraw Solution Park collects graphic extensions, examples and learning materials