There are a number of approaches to studying and measuring crimes including official statistics, self-report studies and victim studies. A victim study, like the Crime Survey of England and Wales, is one which questions people about what crimes they have been a victim of. It often unearths crimes that are not recorded by the police (part of the dark figure) although there is still missing crime and also people may be dishonest or their recollections may be inaccurate in some respects.