The Mountain Alternative Silvicultural Systems (MASS) study is a multi-disciplinary, multi-agency project initiated both for silvicultural and social reasons. MacMillan Bloedel Limited, the Canadian Forest Service, and FERIC cooperated in the study, with participation by the University of Victoria and the University of British Columbia. Three alternative treatments representing a range of canopy removal levels - uniform shelterwood, green tree retention, and patch cutting - were implemented in the research area, located on the east coast of Vancouver Island. FERIC monitored the productivity and cost of the falling and forwarding operations, and measured site disturbance and coarse woody debris for each harvesting treatment. The results of FERIC's study are presented.