• Newnham, R.M.
  Logging Development Program, Forest Management Institute, Canadian Forestry Service, Department of Fisheries and Forestry, Ottawa
  
• Maloley, G.T.
  Computing and Programming Unit, Forest Management Institute, Canadian Forestry Service, Department of Fisheries and Forestry, Ottawa
  

Since 1966, the Forest Management Institute has developed simulation models for pulpwood harvesting machines (Newnham, 1966 and 1967; Newnham and Sjunnesson, 1970). These models imitate the passage of harvesting machines through forest stands and are used to test the effect on harvesting time of machine-component size and oeprating speed. They are particularly valuable in forecasting the potential productivity of new harvesting machines while these machines are still at the conceptual or "drawing-board" stage. If neccessary, modifications may then be made to the original concept or design before proceeding with the construction of a prototype. The development of a machine from the first prototype to the final, profuction model is often a lengthy and costly process. Anything that reduces the time and cost will be most welcome to both the manufacturer and the user.