This volume in the ICAZ series deals with the technical advances made over the last twenty years in the field of ageing and sexing animal bones. The analysis of ancient DNA holds great possibilities for sexing certain faunal assemblages (though by no means all), which is an urgent issue in the study of hunting and animal husbandry. It can be assumed that our forebears used more subtle taxonomic criteria than we do today, and it is important therefore that we are able to recognise traits that will allow for more accurate classification in terms of calendar age or sex. The eighteen papers in this book examine the state of research for various techniques of age/sex determination and assess potential future development.