which do you think would be the most effective in controlling bias?

Discussion 6: Performance Appraisal
For discussion this week, we will be discussing rater bias. Students and employees sometimes complain that ratings of performance are affected by the relationship between the supervisor and rate, and data support this complaint.

Can you recall and instance of this happening to you or someone you know? If so,  explain. What happened? What type of error do you think was made
Do you think this type of bias can be avoided? If so, what can be done?
Of the methods we discussed in class, which do you think would be the most effective in controlling bias? Why?