Bernstein, V., Hakel, M. D., & Harlan, A. (1975). The college student as interviewer: A threat to generalizability? Journal of Applied Psychology, 60(2), 266-268.
http://dx.doi.org/10.1037/h0076544
A review of 6 studies which compared decision-making processes of employment interviewers and college students to examine the generalizability of research conclusions based on college student samples showed that relative to interviewers, students are lenient in their ratings. No other important differences have been reported, and findings appear to be quite comparable with respect to variances, intercorrelations, interrater agreement, and main effects for decision process, content, and accuracy. It is concluded that generalizability should never be merely assumed, but rather demonstrated empirically in other research areas, following the example of the studies involving interview decision-making. (PsycINFO Database Record (c) 2016 APA, all rights reserved)