Resource loaded gantt chart
Resource Leveling needs to be set to Manual for the project in order to adjust leveling in the Gantt chart. Users can have the system automatically level resources by adjusting this setting on the project and selecting Automatic instead of Manual. Applying Resource Leveling in the Gantt Chart. Navigate to a project. Select the Tasks area. Also, to say "what are the semantics of a resource in GANTT" isn't quite hitting the nail on the heada GANTT chart is a project planning tool, and MS project is one software package (I've assumed you're using MS Project) that allows you to assign resources to the tasks that you are planning in a GANTT chart.