Consider the options below, and choose those factors which you consider to be the most significant sources of uncertainty or scatter in data resulting from the Charpy impact test. Note that it might be necessary to choose more than one option to obtain full marks. Experimental scatter in the transition region can reduce confidence in any estimate. It is unreasonable to quote the DBTT to better than the nearest 1C. Variability in the dimensions of the machined notch on the test coupons. Misalignment between the notch and the pendulum. Errors related to the temperature of the coupon. The location of the notch in relation to the microstructure.