The quantity and quality of descriptive information about perpetrators makes an important impact on criminal investigations. For over a decade. the Cognitive Interview (CI) technique has received increasing research attention as a method to improve the accuracy and completeness of eyewitness recall, and such research has led to its incorporation into police training programmes. Although the CI has heen reported to improve both the quantity and quality of resultant information, none of the previous studies has measured information quality from a police perspective. The study reported here is an extension of that of George (1991) and investigates the perceived quality of the descriptions of perpetrators from George's study. The quality of such descriptions. as judged by police officers, is compared across four interview groups before and after training. These interview groups are: untrained (control), CI, Conversation Management (CM) and C I + C M . Thrce measures of quality are investigated, two rating measures and one ranking measure.
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