Within the process of calculating the costs of silvicultural measures in new growth forests, we frequently find ourselves deprived of data collected in the process of marking. System for standard time determination, which includes surface as a unit of productivity measurement instead of tree, is accordingly reasonable. This research is aiming to investigate adequacy of selected tree density and competitor tree density, as an indicator of time consumption in comparison to breast height diameter, as commonly used indicator in relevance to tree, as a unit of measure. Time study of thinning process in spruce pole stand with mixture of fir and beech has been conducted, where in total 72 completed felling and processing cycles has been recorded, out of which 57 were coniferous and 15 deciduous trees. Presented time standardisation systems are established on the basis of regression models, where known independent variable enables to predict more or less accurate estimates of dependent variable. Utilization of linear approximation has been recognized as adequate method in purpose of predicting time consumption. Breast height diameter has been ratified as most accurate indicator, whereas indicators selected tree density and competitor tree density are equivalent in terms of accuracy. Working time structure and work difficulty within productive time operations have been established. Cost analysis has been conducted on the basis of observed productivity in terms of particular tending concept. This research allowed us to evaluate potential improvements within time standardisation system, which is perceived to be crucial in the context of forest tending rationalization.
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