ments and future directions. Oxford: Wiley (pp. 137-160). Kahneman, D. (1973). Attention and effort. Englewood Cliffs, NJ: Prentice-Hall. Kebbell, M. R. & Milne, R. (1998). Police officers' perception of eyewitness performance in forensic investigations. Journal of Social Psychology, 138, 323-333. Kebbell,