Which is better cpm or pert

So far, we have highlighted the main variances between these two terms. It is obvious that they are effective when it comes to PM, but they are not used to execute the same types of tasks. When you compare PERT vs CPM, in summary, you will discover that the former is used in executing ventures with time uncertainty, while the latter is best used in instances that have a fixed time and duration. Definition of CPM CPM critical path method is defined as a set of instructions developed with specific directions to run a program from start to finish.

Basis of Comparison PERT CPM Definition A network planning method that is based on event orientation employed in the management of uncertain activities A PM technique algorithm used in running the events of a program from the beginning to the end Meaning of acronym Project management and review technique Critical path method Use Practical planning and control of time Methodical method for controlling cost and time Orientation Based on events Based on activities Crashing concept Not applicable Applicable Difference Between PERT and CPM: Conclusion So far, we have highlighted the main variances between these two terms.

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But opting out of some of these cookies may have an effect on your browsing experience. Necessary Necessary. The first step is to draw the activities. In the second step, you need to number nodes and prioritize. In CPM, we are supposed to assume that project duration is certain. It is generally used to ascertain the earliest possible starting time of every activity.

The queue is avoided by differentiating critical and non-critical activities. This also helps in reducing time. Any activity can be treated as a critical activity if any delay of such can result in a delay of the whole process. It is mostly found in construction, research projects, engineering, aerospace, plant maintenance, and software development. A CPM method developed should contain four values. There is a list of activities required to finish the project, the duration of each activity to complete, and any dependencies between the activities and milestones to be achieved.

Using this, the longest path from the activities to the milestone or endpoints is found. This process also decides activities that are critical. It determines the least time to complete the project. PERT is a visual project management technique where we plan, schedule, organize, coordinate and control uncertain activities.

Whereas CPM is a statistical technique where we plan, schedule, organize, coordinate and control well-defined activities. CPM is a method used to control cost and time. Unlike PERT, which is a technique used for planning and controlling time.

PERT uses three-point estimation such as optimistic, most likely, and pessimistic. Whereas on the other side, there exists only one estimate in CPM. PERT is used in case of unpredictable activities. On the other hand, CPM is used in the case of predictable activities. PERT is used for jobs that are non-repetitive in nature. It represents the logical sequence of project schedule activities with their relationship in a graphical format.

Moreover, PERT uses probabilistic time estimates to determine the probability of project completion date. Further, it also facilitates calculation of risk involved in project completion date based on beta distribution of each activity time and normal distribution of the expected time.

PERT finds its usage when there is a high degree of uncertainty. Moreover, it uses weighted average formula of three-point estimation technique to calculate the expected activity duration. This helps to calculate activity duration when there is a high degree of uncertainty.

Since PERT accounts for uncertainty and risk the expected duration is more accurate than the single point estimation technique. PERT further allows representation of large amounts of data for further analysis and modelling. Effect of changes on schedule as a result of changes in resources can be evaluated fairly easily.

Program Evaluation and Review Technique mainly helps to control time element of projects. PERT is also used for those projects where percent complete is impossible to determine except for completed milestone. Morgan R.