Forests are the most important natural resources in Scandinavia. The traditional machine chain in Nordic Cut_To_Length (CTL) forest harvesting system consists of a one-grip-harvester for felling, debranching and cutting the stems to logs, and a forwarder for transporting the logs from forest to roadside in separate heaps for each sorts of timber. Forest trucks transport the timber to sawmills and factories. The productivity of a machine chain is currently greatly defined by the experience of the operators of the forestry machines. In addition, there are several parts of the working process, which are repetitive in nature but still require even the most experienced operator’s attention, when he is trying at the same time to do the most challenging tasks. Therefore, there are substantial economic advantages when the level of autonomy is increased, and assistive operations are successfully implemented.