Measuring Behaviour has established itself as a standard text. Largely rewritten, updated and reorganised, this third edition is, as before, a guide to the principles and methods of quantitative studies of behaviour, with an emphasis on techniques of observation, recording and analysis. It provides the basic knowledge needed to measure behaviour, doing so in a succinct and easily understood form. The sections on research design and the interpretation and presentation of data have been greatly expanded. Written with brevity and clarity, Measuring Behaviour is, above all, a practical guide book. Aimed primarily at undergraduate and graduate students in biology and psychology who are about to embark upon quantitative studies of animal and human behaviour, this book provides a concise review of methodology that will be of great value to scientists of all disciplines in which behaviour is measured, including biological anthropology, the social sciences and medicine.