'Clark-Carter has done an excellent job in updating this much-used textbook. The book should be an essential part of a university student’s reading at undergraduate level and a much-needed reference book at postgraduate level. 'The book provides a step-by-step guide to research that students and researchers will find extremely useful. This fourth edition provides consistently outstanding coverage of the core principles of psychological research. An informative and reader-friendly book.' –Dr Zaheer Hussain, Senior Lecturer in Psychology, University of Derby, UK