PERT

Although the project can be successful and seems flawless, it still needs reviews and evaluations. Never assume there is no room for improvement because there are often “invisible” mistakes that people might overlook. This way, managers can ensure the job is moving in the right direction and address any issues early.

This is where PERT can support their project. It answers questions like “how long will the task take?” or “which tasks are most important?” Therefore, workers can prepare themselves to do the task in the most efficient way, especially for large tasks with uncertain activity durations. 

What is the PERT method?

It is a network-based scheduling approach that analyses and represents the tasks involved in completing a project. The first time this method was implemented was in the 1950s.Back then, the United States (U.S.) The Navy was handling a programme that had time uncertainties. It also has interdependent activities. To make it easier, they use PERT.

It helps managers to estimate the minimum time needed to complete a project. The approach uses the critical path, the sequence of tasks that determines the task duration. Then, it uses nodes or arrows in a network diagram to represent each activity. In doing so, PERT allows managers to handle uncertainty and predict the job timelines more accurately. The method uses a calculation, using three time estimates:

• Optimistic time (O): The shortest possible time.
• Most likely time (M): The most probable duration.
• Pessimistic time (P): The longest possible time. 

Those values are used to calculate the expected time (TE). It uses the formula:

Key characteristics in PERT

This method focuses on several key features that will support managers in handling complex and uncertain tasks. In some cases, tasks can be hard to predict. This situation causes unclear timelines and delays, budget uncertainty, increased risks, and more. The purpose of PERT is to help the user avoid those issues.

In short, this method enables managers to plan smarter, handle uncertainty, and improve overall project control. For a better understanding, here is how PERT can help such leaders to solve their management issues:

Focuses on time over cost

This approach is time-oriented. What it means is it mainly focuses on how long tasks take, not how much they cost. It allows users to predict completion dates. Thus, PERT is suitable for projects where budget is not an issue, like R&D or engineering fields. 

Visual-based

As it has been mentioned before, PERT uses a network-based diagram. It has nodes and arrows to show the sequence and connection between tasks. The diagram helps visualise task order dependencies. It has nodes to represent events or milestones, and arrows as activities or tasks that connect the nodes.

Identifies the critical path

One of the most vital parts in project management is the critical path. PERT is applied to find the longest chain of tasks that determines the shortest possible time to complete the job. That means it highlights which tasks are most time-sensitive and pays more focus on those key activities. As a result, it can improve management and prioritisation.

Supports planning for uncertainty

With three estimates, PERT offers a more realistic and flexible view of the task schedule. This method can be helpful when there are activities involving risk or unknown factors. Thus, it makes it easier to plan in uncertain situations and allows for better risk assessment. Usually, this is useful for new or first-time projects. 

Continuous evaluation

Since there is no definite time for completion, PERT allows users to track actual progress compared to planned estimates. It supports ongoing monitoring to aid in making decisions and forecasting. Moreover, the charts can be updated as the project progresses to reflect real conditions and support ongoing monitoring.

Best for one-time projects

PERT is not an approach that people are going to use often. This is only the best for non-repetitive, one-time, complex tasks where workers cannot predict the task durations. That is why this is suitable for product development, engineering design, or scientific research.