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As a classic project management tool, it is now widely used and distributed. It allows to have a good vision of your project and deadlines.


It is undoubtedly the most widespread planning tool. It was used for the first time in 1896 by Karol Adamiecki. It will be H. L. Gantt, a collaborator of F. W. Taylor who will broadcast it from 1910 under his name.

1 – Collect the data

The data is the same to build a diagram  PERT . With the exception that for each task, we will indicate a resource, the person will be in charge of carrying it out.

2 – build the graph

The graphical representation of GANTT is very different from PERT. We will use a system of axis with abscissa time, and ordinate the different tasks. The length of a bar represents the time of a stage.

Using the example given in the article on PERT, we get the following graph :

3 –Calculate margins and associated risks

When building the PERT, we identified the margin of the project by making the difference between the date at the latest and the earliest date of the tasks not on the critical path. 

For each of these margins, we will identify the level of risk of exceeding it.

Watch out for the excess of Murphy’s law. As she says: 

Anything that is likely to go wrong, will necessarily turn out badly.”

From a pessimistic perspective, some of us will then place an excessive margin of safety to guard against problems as the law indicates. For this reason, we often find extended schedules.

Some laws to help planning 

In addition to the laws used by the Critical Chain Management, others also help you better manage your time. 

The Fraisse law

Time is subjective, the more interesting an activity seems to us, the shorter it seems to us. We must therefore be careful not to consider all that is unpleasant as secondary and to postpone these activities and be late.

The Laborit Law 

Everyone has a natural tendency to do the activity they prefer first. To be more efficient, it is better to start with a less pleasant activity that will seem less boring if followed by the promise of a pleasant task. 

Fliess’s Law 

Each individual is animated by his own biological rhythm. Care must be taken to respect each person’s internal biological clock in order to make the most of it.

4 – Manage Resources

Compared to PERT, the GANTT diagram allows us to easily visualize project progress and delays as well as the adequacy of the logical sequence of tasks with our available resources.

The planner, based on updated data and risk levels, will manage resources and reassign tasks as needed.

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