The invention relates to a method for working the soil and an associated construction machine, which comprises at least one rotating drive unit for rotationally driving a tool for working the soil and at least one feed unit, with which the tool for working the soil is placed into the ground. According to the invention, a control and analysis unit is provided, with which when working the soil at least one input variable of the rotating drive unit and/or the feed unit are read and saved, at least one resulting output parameter is read and saved at the tool for working the soil, and the at least one input variable is compared to the resulting output parameter, whereby a soil working value is ascertained and saved.