Seventy five staples and 75 fibres were obtained from three Corriedale breed fleeces which were selected to represent three different levels of soundness. The wools were measured for staple strength, position of break on the staples, the cross sectional area at breakage position and tenacity. The results of statistical analysis indicate the relationships between staple strength and fibre tenacity, and variations in staple strength and fibre tenacity within the sound and unsound wools. One of the main conclusions is that there was a low correlation between the staple strength and fibre tenacity within the sound and unsound wools.