 Snow groomers remained unchanged throughout the 20th century, with most consisting of heavy roller which could be attached to a tractor or snowcat and then hauled across the area to be groomed.The development of more advanced electronic systems in the 1980s allowed manufacturers to produce snow groomers which could work on and replicate a much wider range of terrains, with the most modern even able to produce half-pipes and ramps for snowboarding.Snow groomers are also used in conjunction with snow cannons, to ensure that the snow produced is spread evenly across the resort.