Network Diagram: Highlights of the build

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network graph
A network graph is a quality tool. With the help of it, planning is carried out, as well as work management. In the management of quality in practice, very often use the network graph, or the Gantt chart.

Most often, the network graph is used fordesigning a variety of works that constitute a set of different kinds of actions. The application of the network schedule allows you to determine the timing when the project is completed, also helps to identify the possibility of reducing the time of work. This means that in a networked schedule, time work is interrelated, and this is what gives a good opportunity to control their progress.

A network graph is inherently a curve,a vertex that denotes events (the state of an object or work at a certain point in time), and the arcs of the graph (that is, connecting the vertices of the edge) reflect work. The curve presented in this form is part of the PERT-method (Program Evaluation & Review Technique). It was developed in 1958 in an American company, and its initial goal was planning, as well as an objective assessment of the progress of the project.

The construction of network graphs can be carried out anddifferently. In this case, the vertices of the graph are works, and the arcs show the interconnection existing between them. A similar option is used more often, and this is part of the CPM-method (Critical Path Method), or the method of the critical path.


The order of plotting using the critical path method includes the following steps:

  • Determination of the main purpose of planning.
  • Identify the boundaries that affect the network schedule, as well as the planned work.
  • Determination of the composition of the tasks that are necessary to achieve the goal.
  • The duration of the execution using cards. Here are the tools, resources and all those responsible for the work.
  • Consideration of tasks and the definition of the one that will be performed first.
  • Assign a task that must be performed after the first.
  • Displaying relationships between tasks. Used for this are the arrows showing the sequence of actions. To build a network graph, in our time, for example, MS Visio is used.
  • Determination of the beginning and early termination of each task.
  • The definition of the late start and late end of each task.
  • Determine the backup time for each task. This time is calculated as the difference between late and early beginnings, as well as late and early endings of tasks.
  • Determination of the path at which for each task the time reserve equals zero. This way was called critical.

 building network graphs
If necessary, the network schedule is optimized, and first of all you need to analyze the tasks that are on the critical path.

If you use, for example, large-scalebuilding a network graph, you can easily build a graph of the number of employed workers, the cost of work, the consumption of materials, structures for each period of time. These graphs also allow you to reallocate resources to optimize the network.

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