The Oxford Handbook of Personnel Psychology presents reviews on topical and emergent issues, constructs, and research in personnel psychology. The field of Personnel Psychology is broadly concerned with the study of individual differences and their consequences for the organization. As human resource costs continue, for most organizations, to be the single largest operating cost (50–80% of annual expenditure), achieving optimal performance from individual employees is of paramount importance to the sustained development and financial performance of any organization. The authors are all leading international scholars within the field. The text is divided into six sections: Individual Difference and Work Performance; Personnel Selection; Methodological Issues; Training and Development; Policies and Practices; and Future Challenges.