Lee, JungwonMansour, Jamal K.Penrod, Steven D.2021-02-172021-02-172021-03-29Lee, J., Mansour, J. K. & Penrod, S. D. (2022) 'Validity of mock-witness measures for assessing lineup fairness', Psychology, Crime & Law, 28(3), pp. 215-245.1068-316X1477-2744https://doi.org/10.1080/1068316X.2021.1905811https://eresearch.qmu.ac.uk/handle/20.500.12289/11108Although eyewitness researchers have used mock-witness measures to assess aspects of lineup fairness, they have paid little attention to their validity. The current study tested predictive validity, convergent validity, and discriminant validity of mock-witness measures from a meta-analytic perspective. Overall, mock-witness measures had predictive validity, particularly in target-absent (TA) lineups—the lineup fairness estimated by the measures reliably predicted eyewitnesses’ choosing behaviors and discriminability of a suspect from fillers in TA lineups. However, correlations between lineup fairness estimated by mock-witnesses and eyewitness performance were significant in target-present (TP) lineups only when eyewitnesses had a moderate memory for the perpetrator. Multitrait-multimethod correlations demonstrated significant intradomain correlations between mock-witness measures and other lineup fairness indices and nonsignificant interdomain correlations between the mock-witness measures and indices reflecting memory strength for the perpetrator, which supported convergent validity and discriminant validity, respectively. The implications for research and practice are discussed.215-245enThis is an Accepted Manuscript of an article published by Taylor & Francis in Psychology, Crime, and Law on Mar 29, 2021, available online: http://www.tandfonline.com/10.1080/1068316X.2021.1905811Mock-witnessMock-witness ParadigmEyewitnessLineup FairnessLineup BiasArticle