Literature dealing with the mechanisms of hair breakage in combing and brushing published so far has
been reviewed as a background for the critical evaluation of the method and data analysis of the paper
“Statistical Analysis of Hair Breakage. II” by Evans and Park (1). Accumulated knowledge about hair
breakage in these grooming processes indicates that hair breakage in combing and brushing results from
tangling, looping, knotting, and impact loading. Fatiguing, though responsible for some weakening of the
fi ber in the grooming process, it is unlikely to be a signifi cant factor in hair breakage in combing and
brushing.