Firstly, a finite capacity system takes into account the best time estimate for an activity (cycle) and applies it for the exact quantity to the available resources, taking technical and environmental times (tooling and shifts) into account. Secondly, functions can be activated that take further elements into account (such as the availability of materials, staff and subcontractors). Last but not least, the re-synchronisation of the production plan against each of its variations is performed to provide the user with two elements of strength: the speed of re-processing and the evidence of the effects of the variation on the plan itself.