One part of the procedure for improvement of machinery performance criteria is a multi-objective algorithm for thinning regime optimization. A "relative centre mass" method is used as its basis with relative unit harvesting cost and total and/or merchantable (intermediate and final) cutting volume criteria. The problem of optimum density over time for even-aged, one-species stands is formulated as a nonlinear programming task. The number of cuttings, the intensity of the thinning, and the thinning intervals are defined simultaneously using a "random search" algorithm. The method is applied to pine stands growing in the Russian Northwest region
