"How to Read a Paper" is one of the bestselling texts on evidence-based medicine, used by health care professionals and medical students worldwide. Trisha Greenhalgh's ability to explain the basics of evidence-based medicine in an accessible and readable way means the book is an ideal introduction for all, from first year students to experienced practitioners. This is a text that explains the meaning of critical appraisal and terms such as 'numbers needed to treat', 'how to search the literature', 'evaluate the different types of papers' and 'put the conclusions to clinical use'. New features of the third edition include: new discussion putting evidence-based medicine into the current context, with more emphasis on patient perspectives; increased coverage of qualitative research in evidence-based medicine; and, new information on literature sources and search mechanisms.