About the author Angus McDonald is a Chartered Psychologist with extensive experience of developing psychometric assessments and using them to identify development needs and help individuals realise their potential, nurturing talent in schools and organisations; he wrote Part 1. He is a member of the British Psychological Society and is closely involved in setting and monitoring standards and best practice in the use of tests. Angus has brought together his knowledge of testing and psychology with the expertise of GL Assessment, to produce a guide that is both practical and grounded in scientific research.