Dr Helen Aveyard is a Principal Lecturer at Oxford Brookes University, UK. Helen is the co-author of three other text books: A Postgraduate's Guide to Doing a Literature Review with Sheila Payne and Nancy Preston, A Beginner's Guide to Evidence Based Practice with Pam Sharp, and A Beginner's Guide to Critical Thinking and Writing with Pam Sharp and Mary Woolliams, all published by Open University Press.