Gantt Charts

Gantt Chart example

Most people have little more than a vague understanding of the wonders of the Gantt chart—unless they’re lucky enough to be deeply immersed in project management processes and terminology. There is still great value in getting acquainted with project management basics. And one of those basic building blocks is the Gantt chart.

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What is a Gantt chart?

A Gantt chart is a way to visually represent the tasks and subtasks that make up a project and the time required to complete them. Each task is represented in the chart as a horizontal bar that shows how long each task is planned to take. Because Gantt charts show an entire project workflow from beginning to end, it’s easy to see which tasks need to be completed in order for the next tasks to begin.

In a nutshell, a Gantt chart takes a multi-step process that you’d otherwise have to document in outline or spreadsheet form, and it makes it visual. Digestible. Easier to comprehend and understand.

A Gantt chart represents your overall tasks and schedule as a cascading horizontal bar chart. It’s easy to see at a glance important details like:

Rather than having to read and absorb countless overlapping details in a list format or a cell-by-cell spreadsheet, you can wrap your mind around the entire project process more easily with a Gantt display.

How are Gantt charts used in project management?

Gantt charts are great at showing planned and actual progress of any number of tasks against a horizontal time scale. The tasks are arranged chronologically in a vertical list—often grouped into sub-projects—on the left side of the chart. The relevant dates stretch horizontally across the top of the chart, often grouped into weeks.

Gantt charts are especially helpful during the planning phase and execution phase of a project, and they are also useful in the event that project resources must be reallocated. Today’s interactive Gantt charts make the process even easier, allowing you to drill down into any tasks or zoom out to full project or portfolio views.

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What are the advantages of Gantt charts?

Speaking specifically of cloud-based interactive Gantt charts, like those available in the Workfront solution, the advantages are many. They allow you to:

Even with these advantages, Gantt charts are best viewed as one of many project management tools to be used alongside other tools, so the strengths of each can be leveraged. Comprehensive work management solutions will gather each of these tools into one interactive space, allowing all of them to work seamlessly together.

What are the disadvantages of Gantt charts?

Gantt charts are often most easily used and understood by project management professionals. At first, they can seem incomprehensible to the uninitiated. If your team has a project manager or coordinator on staff who has the job of keeping projects on track, and that person understands how to wield the power of the Gantt chart, it can be a great solution, as part of a complete suite of project management tools.

But if you have a half-dozen “accidental project managers” on your team, all trying to access, update and understand the process individually, a Gantt chart may not be the most intuitive or complete option—especially if it serves as the lone documentation of your process.

Gantt charts also tend to work best with smaller, less complex projects. Why? The main focus of the Gantt chart is time. You have a vertical list of tasks, and you have a horizontal timeline. In a standard, standalone Gantt chart (meaning one that’s not plugged into a comprehensive work management solution), the full complexity and scope of the project are easily lost in translation, as are other details like cost and resource allocation.

Who was Henry Gantt and how did he get a chart named after him?

Henry Laurence Gantt was a mechanical engineer, management consultant, and all-around chart-making guy.

According to Wikipedia:

“He designed his charts so that foremen or other supervisors could quickly know whether production was on schedule, ahead of schedule, or behind schedule.”

Contrary to popular assumption, Gantt was not the inventor of the simple bar chart, which predated him by 100 years. His genius came through his focus on using effective measurement and planning to increase production. Gantt understood that there’s nothing inherently magical about any individual measurement tool; what matters is how you understand and leverage the insights it provides.

Gantt’s ideas are commonplace now, but they were revolutionary in their time. He wrote two books, Work, Wages and Profits in 1916 and Organizing for Work in 1919. His famous chart got its official name in a later book by Wallace Clark, The Gantt Chart: a Working Tool of Management, published in 1923.

The Gantt chart was used in WWI production and mercantile shipping efforts (at the instigation of General William Crozier) as well as the creation of the Hoover Dam and the Interstate Highway system.

In fact, when Colonel John T. Thompson, inventor of the Thompson submachine gun, received the Distinguished Service Medal at the end of World War I, he promptly sent a copy to Gantt with the following note:

“A large share in this reward for the accomplishment of a great war task is due to H.L. Gantt and his assistants. The Gantt general control production chart was my compass.”

Why doesn’t anyone else get to have a chart named after them?

It’s a good question. Most other charts used in project management have far more utilitarian names:

Gantt himself always titled his charts according to their purpose, much like the list above. In fact, the Gantt chart would probably have a different name today, if Wallace Clark’s book hadn’t come along and placed it in elite company with just a few other charts that have managed to retain their creators’ immortal names:

What does a modern Gantt chart look like?

Here is a Gantt chart example within Workfront’s work management software.

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Are Gantt charts for Waterfall project management only?

Gantt charts were developed back when there was really only one way to manage projects, so the methodology everyone followed didn’t have a name. It was just project management.

Now that alternative approaches have arisen, this traditional project management method is often called the Waterfall method, referring to the way that each stage in the project flows into the next, in a strictly linear fashion, as shown above. Gantt charts, which were developed under this paradigm, even visually look like a waterfall, at the task-level view at least, especially when the bars are colored blue. But that doesn’t mean they can’t have applications outside of the Waterfall world.

It wasn’t until the digital revolution that the inadequacies of Waterfall were revealed. Waterfall is great for building concrete projects like bridges and dams—and I mean “concrete” in both a literal and figurative way here—where there can be a clear vision and detailed plan outlined from the beginning. It’s not so great for fluid, ambiguous, completely unprecedented projects that are the norm in software development. The methodology that arose to manage these kinds of initiatives is called Agile project management.

Gantt charts are certainly most at home in Waterfall teams, but they can also be leveraged for teams that follow a mixed-methodology approach, departments where some teams are Waterfall and others are Agile, and even fully Agile teams.

Keep in mind that Waterfall is a mindset and overarching process, while Gantt scheduling is more of a tool or technique that can be adapted and applied in different situations.

Learn more about the Waterfall methodology

Would an Agile team use a Gantt chart?

To be honest, hard-core Agile enthusiasts probably wouldn’t and would rather build an Agile workflow. Agile is a methodology and a movement that even has its own Agile Manifesto. These kinds of conditions can tend to create rigid thinking around Agile, which is ironic, and some incorrectly assume that Agile is an all or nothing proposition.

But many teams successfully blend some aspects of Agile with some aspects of Waterfall, following a hybrid approach that suits their specific needs. For these mixed-methodology teams, and even for less-rigid Agile teams, there are certain situations where Gantt charts can be helpful in establishing more predictable project parameters. This is especially true for Agile or mixed teams that report in to Waterfall stakeholders.

Here’s how one project manager leverages Gantt charts in an Agile environment:

“Even if a project lends itself to naturally assume more Agile-based techniques, not having milestone dates worries most of my stakeholders. In response to this, I began to create a modified version of an Agile sprint backlog using Gantt charts.

This Gantt-backlog chart is a direct way of expressing responsibilities, milestones and the expected product. When updated everyday following a scrum, it shows the viewer progress in an intuitive way.

Clients know when to expect components of the project to be completed and they know when they can be expected to conduct their testing. There is a clear roadmap of how we would reach the final product.”

If that made no sense to you, don’t fret. Agile can sound like a foreign language at first, but it has proven to be worth the learning curve for software developers, marketers, and really any professionals who manage their work in unpredictable or ambiguous environments. And if you ever make the transition to an Agile approach, just know this: you can bring your Gantt charts with you.

Do you pronounce both of the T’s in Gantt?

Nott to the bestt of our knowledge.

The Gantt chart: 100 years young

There you have it: everything you never knew you wanted to know about Gantt charts, gathered together into one handy reference guide.

It’s remarkable, isn’t it? This one little chart, developed more than 100 years ago—even before the invention of sliced bread—is still finding applications in the most forward-thinking approaches to project management in our highly digitized world. That’s a testament to its utility, versatility, and endurance. Here’s to another hundred years of Gantt-influenced project planning.