Monitoring, i.e. repeated surveys based on statistical inventarization, stems from the principles described in a methodology developed by IFER - Institute of Forest Research, Ltd. The methodology was developed, tested and approved within a research project VaV SM/6/153/05 - "Monitoring the development dynamics of natural forests left to spontaneous development; preparation of methodology for the selection of areas with communities meant to be left exposed to the effect of mostly natural forces, proposal of methods and procedures for the management of these areas".

The methodological procedure consists of two parts - data collection in an inventory network of permanent circle plots (size 500 m2) and in a core area (size 1ha) where the complete tree situation is geodetically localized. The combination of both types of data enables getting information about a locality as a whole as well as studying spatial dynamics of a forest in the core area.