Dear Vern:
You've gotten some great advice on using a self-report measure of performance for your research project. I can offer one other alternative, which may or may not work for your situation. I was working with a sample of employees of a single organization. I asked the employees to provide the overall rating from their last formal performance evaluation. I don't think that there was anyone who couldn't provide that information (although this study took place a long time ago, so I may have forgotten). I also asked permission to access the employee's personnel file for just that particular piece of information, and at least half of the respondents agreed to provide that access. I correlated the self-reports with the evaluations from the records and the correlation was quite high (around .90, but again, I'm relying on memory). That gave me a little more confidence to say that the self-reports were at least reasonably accurate.
As I said, this approach may or may not work for you. But best of luck in your research! -- Gayle
Gayle Baugh
Associate Professor
Editor, Group & Organization Management
Co-Editor, Research in Careers series
published by Information Age Publishing
Department of Management & MIS
University of West Florida
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