Encourage people to be objectively reflective about their performance. Being able to see yourself from a higher level is essential for personal evolution and achieving your goals. So you and the people who report to you should be looking at the evidence of their performance together; for this to go well, you need lots and lots of evidence and an objective point of view. If required, use agreed-upon others to triangulate the picture the evidence presents.

Look at the whole picture. In reviewing someone, the goal is to see the patterns and to understand the whole picture. No one can be successful in every way (if they are extremely meticulous, for example, they might not be able to be fast, and vice versa). Assessments made in reviews must be concrete; they’re not about what people should be like but what they are like.
