The objective of this study was to compare grapple yarding feller-director bunched wood with feller-director unbunched wood. The study was done at Weyerhaeuser Forest Products Company's vail operations, near Olympia, Washington. FERIC monitored a Washington 108 grapple yarder in three areas over a period of 16 days. Costs in the three areas ranged from a low of $1.65/m**3 to a high of $3.11 m**3. The bunched-wood area produced 10% more trees per productive machine hour and 36% more trees per turn than the adjacent unbunched area.