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Unformatted text preview: ng method (ADM). This method of constructing a project network diagram uses arrows to represent the activities and connects them at nodes to show their dependencies (see also Section 18.104.22.168). Figure 6-3 shows a simple network logic diagram drawn using ADM. This technique is also called activityon-arrow (AOA) and, although less prevalent than PDM, is still the technique of choice in some application areas. ADM uses only finish-to-start dependencies and may require the use of dummy activities to define all logical relationships correctly. ADM can be done manually or on a computer. .3 Conditional diagramming methods. Diagramming techniques such as Graphical Evaluation and Review Technique (GERT) and System Dynamics models allow for nonsequential activities such as loops (e.g., a test that must be repeated more than once) or conditional branches (e.g., a design update that is only needed if the inspection detects errors). Neither PDM nor ADM allows loops or conditional branches. .4 Network templates. Standardized networks can be used to expedite the preparation of project network diagrams. They can include an entire project or only a portion of it. Portions of a network are often referred to as subnets or fragnets. Subnets are especially useful when a project includes several identical or nearly identical features, such as floors on a high-rise office building, clinical trials on a pharmaceutical research project, program modules on a software project, or the start-up phase of a development project. 6.2.3 Outputs from Activity Sequencing .1 Project network diagrams. Project network diagrams are schematic displays of the project's activities and the logical relationships (dependencies) among them. Figures 6-2 and 6-3 illustrate two different approaches to drawing a project network diagram. A project network diagram may be produced manually or on a computer. It may include full project details, or have one or more summary activities (hammocks). The diagram should be accompanied by a summary narrative that describes the basic sequencing approach. Any unusual sequences should be fully described. A project network diagram is often referred to as a PERT chart. Historically PERT (Program Evaluation and Review Technique) was a specific type of network diagram (see also Section 22.214.171.124). 70 NAVIGATION LINKS ACROYMNS LIST ACRONYMS LIST ACROYMNS LIST A Guide to the Project Management Body of Knowledge (PMBOK Guide) 2000 Edition 2000 Project Management Institute, Four Campus Boulevard, Newtown Square, PA 19073-3299 USA Chapter 6--Project Time Management .2 Activity list updates. In much the same manner that the activity definition process may generate updates to the WBS, preparation of project network diagrams may reveal instances where an activity must be divided or otherwise redefined to diagram the correct logical relationships. 6.3 ACTIVITY DURATION ESTIMATING
Activity duration estimating is the process of taking information on project scope and resources and...
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This document was uploaded on 09/27/2013.
- Fall '13
- The American