A power tool operator protection system comprising a plurality of wearable position sensors (12a-e) configured to be worn by an operator of a handheld power tool ; a power tool position sensor configured to detect the position of a handheld power tool ; and processing equipment configured to: receive position data from the wearable position sensors (12a-e) and the power tool position sensor ; based on the position data received from the wearable position sensors (12a-e), generate a model of the operator , the model representing the operator's posture and being based on the mutual positions of the respective wearable sensors (12a-e) relative to each other; associate each limb (32a; 32c; 32e) of a plurality of limbs of the operator , as represented by the model , with a respective protection volume (30a; 30c, 30d; 30e, 30f); based on the position data received from the power tool position sensor , determine a position of a working implement of the power tool ; and based on the position and/or motion of the power tool in relation to the protection volume (30a; 30c, 30d; 30e, 30f) indicating an imminent danger that the working implement enters a protection volume (30a; 30c, 30d; 30e, 30f), generate a protection signal. a plurality of wearable position sensors (12a-e) configured to be worn by an operator of a handheld power tool ; a power tool position sensor configured to detect the position of a handheld power tool ; and processing equipment configured to: receive position data from the wearable position sensors (12a-e) and the power tool position sensor ; based on the position data received from the wearable position sensors (12a-e), generate a model of the operator , the model representing the operator's posture and being based on the mutual positions of the respective wearable sensors (12a-e) relative to each other; associate each limb (32a; 32c; 32e) of a plurality of limbs of the operator , as represented by the model , with a respective protection volume (30a; 30c, 30d; 30e, 30f); based on the position data received from the power tool position sensor , determine a position of a working implement of the power tool ; and based on the position and/or motion of the power tool in relation to the protection volume (30a; 30c, 30d; 30e, 30f) indicating an imminent danger that the working implement enters a protection volume (30a; 30c, 30d; 30e, 30f), generate a protection signal. receive position data from the wearable position sensors (12a-e) and the power tool position sensor ; based on the position data received from the wearable position sensors (12a-e), generate a model of the operator , the model representing the operator's posture and being based on the mutual positions of the respective wearable sensors (12a-e) relative to each other; associate each limb (32a; 32c; 32e) of a plurality of limbs of the operator , as represented by the model , with a respective protection volume (30a; 30c, 30d; 30e, 30f); based on the position data received from the power tool position sensor , determine a position of a working implement of the power tool ; and based on the position and/or motion of the power tool in relation to the protection volume (30a; 30c, 30d; 30e, 30f) indicating an imminent danger that the working implement enters a protection volume (30a; 30c, 30d; 30e, 30f), generate a protection signal. <EOS>