One thing that I've learned over the years is that evaluating your own performance and the performance of others is in itself a skill that needs to be developed

One thing that I've learned over the years is that evaluating your own performance and the performance of others is in itself a skill that needs to be developed. Being able to reward high performers requires them to first be identified! In absence of the specific knowledge needed to assess perf, people fall back to likeability and other biases.