The USA and the UK are like-minded nations with similaritiesthat extend well beyond their common language. An institutionalsimilarity is in legal systems (e.g. both nations operate undercommon law) and a cultural similarity is in crime rates [1]. Yetanother similarity is that police investigators in both nations oftenadminister a line-up procedure to an eyewitness during the courseof a criminal investigation. However, the details of how line-upsare presented in the two nations are quite different, and our goalwas to determine if the diagnostic accuracy of the US line-upprocedure differs from that of the UK line-up procedure.A line-up consists of the police suspect, who is either innocentor guilty, and several other individuals, or fillers, who resemblethe suspect and are known innocents. Although the US and UK

The term conformity is often used to indicate an agreement to the majority position, brought about either by a desire to ‘fit in’ or be liked (normative) or because of a desire to be correct (informational), or simply to conform to a social role (identification).