Page 170 - DCAP601_SIMULATION_AND_MODELING

Simulation and Modelling

Notes The Activity Network diagram displays interdependencies between tasks during the use of
boxes and arrows. Arrows pointing into a task box come from its predecessor tasks, which must
be completed before the task can start. Arrows pointing out of a task box go to its successor tasks,
which cannot start until at least this task is complete.

Activity Network (PERT) Chart

Activity Network and Project Evaluation and Review Technique, or PERT, charts are a way of
documenting and examine the tasks in a project. They consist of a series of boxes representing
tasks with arrows connecting them to show the flow from one task to another. Each box may
include the name of the task, the names of those answerable for carrying the task out, and the
time estimated to complete each task. This estimate may include a best time, a worst time, and
the average of the two.

Figure 9.5: Airplane Design Process

Typical Uses

Activity Networks and PERT Charts are typically used to document complex projects in a visual
manner. Elements such as expected time and actual time help viewers make adjustments, and
reduce the occurrence of errors during the project. They are also used to establish the critical
path of a project.

Best Practices

1. Determine the tasks: The first step in making an Activity Network (PERT) chart is to
establish what tasks are involved in the project.
2. Establish order: Using one of the conventional Activity Network (PERT) Chart objects,
layout each task in the order which it will be completed during the project. Some find
using a Gantt Chart helpful when doing this. Also, creating the chart can be made quick
and easy using the Activity Network (PERT) Chart template offered by SmartDraw.
3. Establish the critical path: Draw arrows between the tasks to symbolize the critical path
for the project. Any deviation from the critical path can cause delays or errors in the
project.

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