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However, we will stick to the convention indicated in PMBOK, which states that, the project starts on day 1. This critical path method (cpm) example problem uses the convention that project starts on day one.Īnother convention for cpm analysis states that the project starts on day zero. Here, it is essential to point out that critical path analysis has two conventions for calculation. Step – 3.1 : Calculate Early Start and Early Finish of activities on Critical Path.
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We need to start with activities on critical path. The next step is to calculate early start and early finish of each activity. The network diagram with critical path will look as follows Project Schedule Network Diagram Indicating Critical Path in Bold Step – 3 : Perform Forward Pass on Critical Path Indicate the critical path on the network diagram with a bold line.
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Hence, path S-B-C-E-G-E’ is the critical path of the above schedule network diagram. The longest path in the network above is S-B-C-E-G-E’ with a duration of 22 weeks. Fourth path is S – B – F – G – E’ the duration of this path is equal to 20 weeks.The third path is S – B – C – E – G – E’ the duration of this path is 22 weeks.The second path is S – A – E – G – E’ the duration of which is also equal to 16 weeks.First path is Start (S) – A – D – E – End (E’) the duration of this path is 16 weeks.The following indicates description of all the paths. The path with longest duration is the critical path. The schedule network diagram shown above has four paths. To achieve this first identify all the paths in the network. The first and the most crucial critical path analysis step is to identify the critical path. Critical Path Analysis Example Problem Step – 1 : Calculate the total number of paths and their duration. To understand the critical path analysis calculation steps consider the following schedule network diagram. Precedence Diagramming Method AON Nomenclature Critical Path Method Example With Solution
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The following figure represents PMBOK nomenclature for activity nodes in precedence diagram method. Therefore, critical path analysis example problem uses activity-on-node method to represent the schedule network logic. Most of the scheduling programs use PDM technique to construct project network diagram. In AON the nodes represent the schedule activities. Further, PDM method uses Activity-on-Node (AON) diagramming technique to represent the schedule logic. The critical path analysis uses Precedence Diagram Method (PDM) to construct the schedule network. The first activity of critical path analysis is to draw a schedule network diagram. Critical Path Analysis Schedule Network Diagramming Techniques Thus schedule flexibility is the permissible delay that does not affect project completion date. Hence critical path analysis specifies permissible delays to activities that are not on critical path. It is important to realize that not all activities can start and finish on time. The analysis not only indicates completeness of project schedule but also ascertains degree of scheduling flexibility. Moreover, critical path analysis also reveals the minimum duration required to complete a project.Ĭritical path analysis also specifies link between project activities.
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