With the increasing number of products that must be separated in the forest, it’s becoming increasingly important to carefully evaluate the impact of sorting on the productivity of forestry machines. As well, the assortment of log products is becoming increasingly diverse, with log lengths ranging from 2.5 m (8 ft) to 7.3 m (24 ft). This report summarizes the results obtained thus far by FERIC in terms of the impact of log lengths and of the number of products to separate on the productivity of cut-to-length harvesting machines. We developed a productivity model for single-grip harvesters as a function of mean stem volume (m³), the number of products to separate, the use of multi-stem processing, and the mean log length, and another model for forwarders as a function of the payload per trip, the travel speed, the number of products to separate, the mean log length, and the extraction trail length. A cost analysis is also presented that demonstrates, among other things, that the production of short logs has a significant negative impact on costs.