# Cpm and pert method. What is PERT in Project Management? Project Management Guide 2019-02-14

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## Critical path method

The students will however notice that this time is shorter than the total time listed under Table 1 which will be 45 days. These activities listed in the order of precedence are given below: In this graph jobs are shown as arrows leading from one circle on the graph to another. After that, the dependency between the activities is determined. These activities need to be completed in a sequence, with each stage being more-or-less completed before the next stage can begin. Unproductive time was reduced from 125 to 93 hours. Since there are no activities that come after f or g, it is recommended but again not required to connect them to a node labeled finish. Week 3 2 weeks Sequential D G.

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## PERT vs. CPM: What’s the Difference?

The result of this study can then be used to determine the appropriate production centers that should be set up to serve specific areas in Mindanao. It also makes use of many assumption that can accelerate or delay the project progress. Week 8 1 week Sequential G J. Having computed the various parameters of each activity, we are now ready to go into the scheduling phase, using a type of bar chart known as the Gantt Chart. Likewise, activity d or activity f can be delayed 4.

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## Critical Path Analysis and PERT

To determine the path times, add the task durations for all available paths. The transportation method was first formulated as a special procedure for finding the minimum cost program for distributing homogeneous units of a product from several points of supply to a number of points of demand. So the Earliest Start at event 3 is 4. An arrow running between two event circles shows the activity needed to complete that task. Both techniques are used to manage projects within a specific timeframe.

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## CPM & PERT Weaknesses & Strengths

By convention, all arrows run left to right. Determine the The is the longest path of the network diagram. Use the formula below to calculate the time to use for each project stage: shortest time + 4 x likely time + longest time ---------------------------------------------------------- 6 This helps to bias time estimates away from the unrealistically short time-scales normally assumed. On the other hand, if activity c can be reduced to one work day, the path time for aceg is reduced to 15. Similarly, at Event 4, we find we have to evaluate two predecessor activities — Activity 2-4 and Activity 3-4. Some activities are serially linked. One possible method to maximize solution robustness is to include safety in the baseline schedule in order to absorb the anticipated disruptions.

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## Critical path method

Activity-on-node diagram showing critical path schedule, along with total float and critical path drag computations In this diagram, Activities A, B, C, D, and E comprise the critical or longest path, while Activities F, G, and H are off the critical path with floats of 15 days, 5 days, and 20 days respectively. Frequently, project managers use both techniques. There are various other types of float Independent, Early Free, Early Interfering, Late Free, Late Interfering , and float can also be negative. Managing Projects as Investments: Earned Value to Business Value. Positive slack would indicate ahead of schedule; negative slack would indicate behind schedule; and zero slack would indicate on schedule.

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## PERT vs. CPM: What’s the Difference?

Slack is the length of time an activity can be delayed without increasing the project completion time. The poor management can cause delay or the surpassing of the amount of that product than the prescribed budget, which results in the loss and shame to the company. Most primarily, using this technique three estimates for the time required are made; the most promising, the most probable, and the most unfavorable. Once all the activities that can be scheduled are scheduled to the convenience of the project, normally reflecting resource optimisation measures, we can say that the project has been scheduled. We shall not go into these situations at present for the sake of simplicity and be concerned only with Total Float for the time being. It also decides that what aspect of the project should be reduced or increased when the trade-off is needed.

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## Difference Between PERT & CPM

For example, we might send the staff on leave during that one week or give them some other work to do. A further benefit of Critical Path Analysis is that it helps you to identify the minimum length of time needed to complete a project. Navy's Polaris nuclear submarine project. This is especially useful in managing projects with areas of overlap, long time-consumption, or even delay because you can approach the scheduling of a project on a separate task basis, visualize them in a flowchart, and then get a near exact estimate on the duration each individual task will require. Total Project Control 2nd Edition : A Practitioner's Guide to Managing Projects as Investments. Without an accurate estimate, no project can be completed within the budget and the target completion date.

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## PERT vs. CPM: What’s the Difference?

An activity with zero float is not necessarily on the critical path since its path may not be the longest. The arrow between them shows the activity of carrying out the High-Level Analysis. This is particularly the case in Engineering projects. It compels managers to plan their projects critically and analyse all factors affecting the progress of the plan. In the diagram, for example, the tasks between nodes 1, 2, 4, 8, and 10 must be completed in sequence.

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