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This is an effective and practical tool for project management created by Henry Gantt in 1917, which remains the most widely used representation tool. It consists of a graphic diagram useful for project planning and gives information and time frames for a project's phases, activities, tasks and resources.

Tasks are put in rows and durations (days, weeks or months) in columns. They are represented by bars whose length is proportional to the estimated duration. These can take place sequentially or partially or entirely simultaneously.