What is the S-Curve in Project Management?
In project management glossary, an s-curve is a mathematical graph that illustrates relevant cumulative data for a project; such as cost or man-hours—plotted against time. The reason it’s called an s-curve is that the shape of the graph commonly float a loose, shallow “S.” (The shape depends on the type of project, though, so other formations are possible.)An s-curve in project management is typically used to track the progress of a project. In today’s fast-moving business climate, ensuring that a project is on schedule and on-budget is paramount to its success.
Why an “S”?
The s-curve often forms the shape of an “s” because the growth of the project in the beginning stages is usually slow: The balls are just beginning to roll; team members are either researching the industry or just starting to engage in the first phase of execution, which can take longer at first, before they get the hang of it or before there are kinks to work out.
Then, as more progress is made, the growth expedites rapidly—creating that upward slope that forms the central part of the “s.” This point of maximum growth is called the point of inflexion. During this period, project team members are working heavily on the project, and many of the major costs of the project are incurred. After the point of inflexion, the growth begins to upland, forming the upper part of the “s” known as the upper asymptote—and the “mature” phase of the project. This is because the project is mostly finished at this point and is coming to an end: Typically only tasks such as finishing touches and final approvals are left at this point.
The s-curve often forms the shape of an “s” because the growth of the project in the beginning stages is usually slow: The balls are just beginning to roll; team members are either researching the industry or just starting to engage in the first phase of execution, which can take longer at first before they become proficient in it.
Common uses for the s-curve in project management
Some of the most common uses for s-curves are to measure progress, evaluate performance and make cash-flow forecasts.
An s-curve is helpful in monitoring and forecasting the success of a project because actual, real-time cumulative data of various elements of the project—such as cost—can be compared with projected data. The degree of alignment between the two graphs reveals the progress—or lack thereof—of whichever element is being studied. If corrections need to be made to get back on track, the s-curve can help identify them.
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