Do not mislead you there, it is well a bar chart whom you visualize below (click above to increase the image). Only it represents the
periods of your project and not an assembly of tasks. The advantages, it is that you follow and control only the key dates of your projects.
Finally which is the importance which such task or such other is to 72% or 90% of advance. The significant one is well: when are us capable to
deliver our project in the timeline.