Talking to a client last week, I had to ask that rather than sit and measure performance, the supervisor participate in the workshop. I explained that the Doppler Effect would almost guarantee a lower score for her employees than they would get if everyone in the room were involved.
David Gurteen started following me on Twitter at which point I discovered his wonderful blog. Here's a post about measurement of performance in business.
David breaks everything down into the smallest pieces before commenting on the whole. It's articulate, generous and eliminates assumptions. Don't you love someone for defining his terms? Why is this so unusual when we use business jargon?
It's worth seeing the related posts on incentivizing performance as well.