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Purpose: To show the paths to complete a project, find the shortest
time possible for the project, and graphically display simultaneous activities.
The arrow diagram is closely related to a CPM (critical path method)
or PERT (program evaluation and review technique) diagram. It is also
known as an activity network diagram. It can be used to plan the schedule
for any series of tasks and to control their completion. The arrow diagram
removes most of the complexity of CPM and PERT methods, and retains the
flow from task to task and the timing required for each task. It does,
however, require that you know what each task is and how long it takes.
Without such knowledge, itıs difficult to develop the arrow diagram. To
develop the diagram:
Process
- Brainstorm all of the tasks required to complete a given project,
including the estimated time required for each task. Again, note cards
are useful for this process.
- Sequence all of the cards from the start to finish, removing duplications,
adding new ones as additional tasks are identified, and placing parallel
activities where they belong.
- Reevaluate the shortest, longest, and average estimated times for
each task and identify the longest path through the diagram.
- Use the diagram to track progress of each activity throughout the
project life cycle. Any time an element gets in jeopardy, it may need
to be examined and necessary resources shifted to complete it.
Find out more about affinity diagrams at: asq.org
The Arrow Diagram is just one of the tools included in the QI
Macros for Excel SPC Software for Excel.
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the FREE 30-day Evaluation copy of the QI Macros Excel SPC Software for Six
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