RT Journal Article SR Electronic T1 Overview of research designs JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 546 OP 549 DO 10.1136/emj.19.6.546 VO 19 IS 6 A1 M J Clancy YR 2002 UL http://emj.bmj.com/content/19/6/546.abstract AB The fourth paper in the research series looks at the difficulties in establishing truth for the researcher and provides an overview of research design.